feat(media): video + photo libraries with real libVLC playback, now playing clips, gallery + slideshow, device media sync rules (true-parity phase 8)

NotZune.sln

@@ -31,6 +31,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NotZune.Tests.Application",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NotZune.Tests.Domain", "tests\NotZune.Tests.Domain\NotZune.Tests.Domain.csproj", "{275BFD54-E360-44EC-8A6C-03D6167413BF}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NotZune.Infrastructure.Video", "src\NotZune.Infrastructure.Video\NotZune.Infrastructure.Video.csproj", "{E7DE99F2-2C5A-46E4-A646-306A59915A2F}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -88,6 +90,10 @@ Global
 		{275BFD54-E360-44EC-8A6C-03D6167413BF}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{275BFD54-E360-44EC-8A6C-03D6167413BF}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{275BFD54-E360-44EC-8A6C-03D6167413BF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E7DE99F2-2C5A-46E4-A646-306A59915A2F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E7DE99F2-2C5A-46E4-A646-306A59915A2F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E7DE99F2-2C5A-46E4-A646-306A59915A2F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E7DE99F2-2C5A-46E4-A646-306A59915A2F}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{9C687BB5-6AE3-4C94-A12F-6D34C5DAAFFD} = {386DD2E6-7733-4758-9DEF-333286DDB86F}
@@ -102,5 +108,6 @@ Global
 		{E0F28BF6-1159-41CC-BBEE-1FBAFED53447} = {386DD2E6-7733-4758-9DEF-333286DDB86F}
 		{17B493BB-CFCB-423D-844F-3ECD6BA3D6CC} = {89103A14-FD5B-4F9F-9AEF-803F5D97F55C}
 		{275BFD54-E360-44EC-8A6C-03D6167413BF} = {89103A14-FD5B-4F9F-9AEF-803F5D97F55C}
+		{E7DE99F2-2C5A-46E4-A646-306A59915A2F} = {386DD2E6-7733-4758-9DEF-333286DDB86F}
 	EndGlobalSection
 EndGlobal

src/NotZune.Application/Interfaces/IPhotoLibraryService.cs

@@ -0,0 +1,13 @@
+using NotZune.Domain.Models;
+
+namespace NotZune.Application.Interfaces;
+
+public interface IPhotoLibraryService
+{
+    Task<IReadOnlyList<Photo>> GetAllPhotosAsync();
+
+    Task ScanDirectoryAsync(string directoryPath, IProgress<double>? progress = null);
+
+    /// <summary>Distinct folder paths currently present in the photo library.</summary>
+    Task<IReadOnlyList<string>> GetFoldersAsync();
+}

src/NotZune.Application/Interfaces/IVideoLibraryService.cs

@@ -0,0 +1,12 @@
+using NotZune.Domain.Models;
+
+namespace NotZune.Application.Interfaces;
+
+public interface IVideoLibraryService
+{
+    Task<IReadOnlyList<Video>> GetAllVideosAsync();
+
+    Task ScanDirectoryAsync(string directoryPath, IProgress<double>? progress = null);
+
+    Task MarkPlayedAsync(Guid videoId);
+}

src/NotZune.Application/Interfaces/IVideoPlaybackEngine.cs

@@ -0,0 +1,30 @@
+namespace NotZune.Application.Interfaces;
+
+/// <summary>
+/// Real video playback boundary (libVLC-backed). The Avalonia VideoView binds to
+/// <see cref="MediaPlayerHandle"/>; all operations no-op safely when unavailable.
+/// </summary>
+public interface IVideoPlaybackEngine : IDisposable
+{
+    bool IsAvailable { get; }
+
+    object? MediaPlayerHandle { get; }
+
+    void LoadAndPlay(string filePath);
+
+    void Play();
+
+    void Pause();
+
+    void Stop();
+
+    void SetVolume(double volume, bool muted);
+
+    void Seek(TimeSpan position);
+
+    TimeSpan GetPosition();
+
+    TimeSpan GetDuration();
+
+    event EventHandler? PlaybackEnded;
+}

src/NotZune.Application/Models/AppSettings.cs

@@ -42,6 +42,8 @@ public class AppSettings
     public int SpaceReservationPercent { get; set; } = 10;
     public string MusicSyncRule { get; set; } = "All Music (Automatic Sync)";
     public string PodcastSyncRule { get; set; } = "3 Newest Episodes";
+    public string VideoSyncRule { get; set; } = "All Videos & Pictures";
+    public string PicturesSyncRule { get; set; } = "Newest 25 Items";
     public bool WirelessSyncEnabled { get; set; } = true;
     public string NetworkName { get; set; } = "Home-WiFi (WPA2)";
 

src/NotZune.Application/Services/DefaultVideoServices.cs

@@ -0,0 +1,37 @@
+using NotZune.Application.Interfaces;
+using NotZune.Domain.Models;
+
+namespace NotZune.Application.Services;
+
+/// <summary>Default no-op video library used when the persistence layer is not wired (e.g. unit tests).</summary>
+public sealed class EmptyVideoLibraryService : IVideoLibraryService
+{
+    public Task<IReadOnlyList<Video>> GetAllVideosAsync() => Task.FromResult<IReadOnlyList<Video>>(new List<Video>());
+    public Task ScanDirectoryAsync(string directoryPath, IProgress<double>? progress = null) => Task.CompletedTask;
+    public Task MarkPlayedAsync(Guid videoId) => Task.CompletedTask;
+}
+
+/// <summary>Default no-op photo library used when the persistence layer is not wired (e.g. unit tests).</summary>
+public sealed class EmptyPhotoLibraryService : IPhotoLibraryService
+{
+    public Task<IReadOnlyList<Photo>> GetAllPhotosAsync() => Task.FromResult<IReadOnlyList<Photo>>(new List<Photo>());
+    public Task ScanDirectoryAsync(string directoryPath, IProgress<double>? progress = null) => Task.CompletedTask;
+    public Task<IReadOnlyList<string>> GetFoldersAsync() => Task.FromResult<IReadOnlyList<string>>(new List<string>());
+}
+
+/// <summary>Default unavailable video engine (no libVLC) — all operations are safe no-ops.</summary>
+public sealed class UnavailableVideoPlaybackEngine : IVideoPlaybackEngine
+{
+    public bool IsAvailable => false;
+    public object? MediaPlayerHandle => null;
+    public void LoadAndPlay(string filePath) { }
+    public void Play() { }
+    public void Pause() { }
+    public void Stop() { }
+    public void SetVolume(double volume, bool muted) { }
+    public void Seek(TimeSpan position) { }
+    public TimeSpan GetPosition() => TimeSpan.Zero;
+    public TimeSpan GetDuration() => TimeSpan.Zero;
+    public event EventHandler? PlaybackEnded { add { } remove { } }
+    public void Dispose() { }
+}

src/NotZune.Desktop/App.axaml.cs

@@ -10,7 +10,8 @@ using NotZune.Domain.Models;
 using NotZune.Infrastructure.Audio;
 using NotZune.Infrastructure.Devices;
 using NotZune.Infrastructure.External;
-using NotZune.Infrastructure.Persistence;using NotZune.UI.Services;
+using NotZune.Infrastructure.Persistence;
+using NotZune.Infrastructure.Video;using NotZune.UI.Services;
 using NotZune.UI.ViewModels;
 
 namespace NotZune.Desktop;
@@ -77,6 +78,9 @@ public partial class App : Avalonia.Application
         services.AddSingleton<IExternalMetadataService, ExternalMetadataService>();
         services.AddSingleton<IArtistEnrichmentService, ArtistEnrichmentCoordinator>();
         services.AddSingleton<ISmartPlaylistService, SmartPlaylistService>();
+        services.AddSingleton<IVideoLibraryService, VideoLibraryService>();
+        services.AddSingleton<IPhotoLibraryService, PhotoLibraryService>();
+        services.AddSingleton<IVideoPlaybackEngine, VideoPlaybackEngine>();
 
         // 3. Audio & Hardware Subsystems
         services.AddSingleton<AudioEngine>();
@@ -108,6 +112,28 @@ public partial class App : Avalonia.Application
                 CreatedAtUtc TEXT NOT NULL,
                 UpdatedAtUtc TEXT NOT NULL)");
 
+            ctx.Database.ExecuteSqlRaw(@"CREATE TABLE IF NOT EXISTS Videos (
+                Id TEXT NOT NULL PRIMARY KEY,
+                Title TEXT NOT NULL,
+                FilePath TEXT NOT NULL,
+                Duration TEXT NOT NULL,
+                Year INTEGER,
+                Genre TEXT NOT NULL,
+                ArtworkUri TEXT,
+                PlayCount INTEGER NOT NULL,
+                LastPlayedAtUtc TEXT,
+                SizeBytes INTEGER NOT NULL,
+                AddedAtUtc TEXT NOT NULL)");
+
+            ctx.Database.ExecuteSqlRaw(@"CREATE TABLE IF NOT EXISTS Photos (
+                Id TEXT NOT NULL PRIMARY KEY,
+                Title TEXT NOT NULL,
+                FilePath TEXT NOT NULL,
+                FolderPath TEXT NOT NULL,
+                TakenDate TEXT,
+                SizeBytes INTEGER NOT NULL,
+                AddedAtUtc TEXT NOT NULL)");
+
             if (!ctx.Tracks.Any())
             {
                 // Artists

src/NotZune.Desktop/NotZune.Desktop.csproj

@@ -2,6 +2,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\NotZune.UI\NotZune.UI.csproj" />
+    <ProjectReference Include="..\NotZune.Infrastructure.Video\NotZune.Infrastructure.Video.csproj" />
   </ItemGroup>
 
   <ItemGroup>

src/NotZune.Domain/Models/VideoModels.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace NotZune.Domain.Models;
+
+public class Video
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public string Title { get; set; } = string.Empty;
+    public string FilePath { get; set; } = string.Empty;
+    public TimeSpan Duration { get; set; }
+    public int? Year { get; set; }
+    public string Genre { get; set; } = string.Empty;
+    public string? ArtworkUri { get; set; }
+    public int PlayCount { get; set; }
+    public DateTime? LastPlayedAtUtc { get; set; }
+    public long SizeBytes { get; set; }
+    public DateTime AddedAtUtc { get; set; } = DateTime.UtcNow;
+}
+
+public class Photo
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public string Title { get; set; } = string.Empty;
+    public string FilePath { get; set; } = string.Empty;
+    public string FolderPath { get; set; } = string.Empty;
+    public DateTime? TakenDate { get; set; }
+    public long SizeBytes { get; set; }
+    public DateTime AddedAtUtc { get; set; } = DateTime.UtcNow;
+}

src/NotZune.Infrastructure.Persistence/AppDbContext.cs

@@ -12,6 +12,8 @@ public class AppDbContext : DbContext
     public DbSet<Playlist> Playlists => Set<Playlist>();
     public DbSet<PlayHistoryEntry> PlayHistory => Set<PlayHistoryEntry>();
     public DbSet<SmartPlaylist> SmartPlaylists => Set<SmartPlaylist>();
+    public DbSet<Video> Videos => Set<Video>();
+    public DbSet<Photo> Photos => Set<Photo>();
 
     public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
     {
@@ -72,5 +74,19 @@ public class AppDbContext : DbContext
                     v => System.Text.Json.JsonSerializer.Serialize(v, (System.Text.Json.JsonSerializerOptions?)null),
                     v => System.Text.Json.JsonSerializer.Deserialize<List<SmartPlaylistRule>>(string.IsNullOrEmpty(v) ? "[]" : v, (System.Text.Json.JsonSerializerOptions?)null) ?? new List<SmartPlaylistRule>());
         });
+
+        modelBuilder.Entity<Video>(entity =>
+        {
+            entity.HasKey(v => v.Id);
+            entity.HasIndex(v => v.Title);
+            entity.HasIndex(v => v.FilePath);
+        });
+
+        modelBuilder.Entity<Photo>(entity =>
+        {
+            entity.HasKey(p => p.Id);
+            entity.HasIndex(p => p.FilePath);
+            entity.HasIndex(p => p.FolderPath);
+        });
     }
 }

src/NotZune.Infrastructure.Persistence/PhotoLibraryService.cs

@@ -0,0 +1,104 @@
+using Microsoft.EntityFrameworkCore;
+using NotZune.Application.Interfaces;
+using NotZune.Domain.Models;
+
+namespace NotZune.Infrastructure.Persistence;
+
+/// <summary>
+/// SQLite-backed photo library with recursive folder scanning (PHOTOLIBRARY parity).
+/// </summary>
+public sealed class PhotoLibraryService : IPhotoLibraryService
+{
+    private static readonly HashSet<string> PhotoExtensions = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ".jpg", ".jpeg", ".png", ".bmp", ".gif", ".webp"
+    };
+
+    private readonly IDbContextFactory<AppDbContext> _contextFactory;
+
+    public PhotoLibraryService(IDbContextFactory<AppDbContext> contextFactory)
+    {
+        _contextFactory = contextFactory;
+    }
+
+    public async Task<IReadOnlyList<Photo>> GetAllPhotosAsync()
+    {
+        await using var ctx = await _contextFactory.CreateDbContextAsync();
+        var photos = await ctx.Photos.OrderBy(p => p.FolderPath).ThenBy(p => p.FilePath).ToListAsync();
+        return photos;
+    }
+
+    public async Task ScanDirectoryAsync(string directoryPath, IProgress<double>? progress = null)
+    {
+        if (!Directory.Exists(directoryPath))
+        {
+            return;
+        }
+
+        var files = Directory.EnumerateFiles(directoryPath, "*", SearchOption.AllDirectories)
+            .Where(f => PhotoExtensions.Contains(Path.GetExtension(f)))
+            .ToList();
+
+        await using var ctx = await _contextFactory.CreateDbContextAsync();
+        var existingPaths = (await ctx.Photos.ToListAsync()).Select(p => p.FilePath).ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        var added = 0;
+        for (var i = 0; i < files.Count; i++)
+        {
+            var file = files[i];
+            if (existingPaths.Contains(file))
+            {
+                continue;
+            }
+
+            var photo = new Photo
+            {
+                Title = Path.GetFileNameWithoutExtension(file),
+                FilePath = file,
+                FolderPath = Path.GetDirectoryName(file) ?? directoryPath,
+                SizeBytes = new FileInfo(file).Length,
+                TakenDate = TryGetTakenDate(file),
+                AddedAtUtc = DateTime.UtcNow
+            };
+
+            ctx.Photos.Add(photo);
+            added++;
+
+            if (added % 50 == 0)
+            {
+                await ctx.SaveChangesAsync();
+                progress?.Report(files.Count == 0 ? 1.0 : (double)i / files.Count);
+            }
+        }
+
+        await ctx.SaveChangesAsync();
+        progress?.Report(1.0);
+    }
+
+    public async Task<IReadOnlyList<string>> GetFoldersAsync()
+    {
+        await using var ctx = await _contextFactory.CreateDbContextAsync();
+        var folders = await ctx.Photos
+            .Select(p => p.FolderPath)
+            .Distinct()
+            .OrderBy(f => f)
+            .ToListAsync();
+        return folders;
+    }
+
+    private static DateTime? TryGetTakenDate(string filePath)
+    {
+        try
+        {
+            // Prefer the file's creation timestamp as a lightweight "taken" approximation;
+            // full EXIF parsing is deferred (TagLib# image support is format-limited).
+            var info = new FileInfo(filePath);
+            var candidate = info.CreationTimeUtc < info.LastWriteTimeUtc ? info.CreationTimeUtc : info.LastWriteTimeUtc;
+            return candidate;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+}

src/NotZune.Infrastructure.Persistence/VideoLibraryService.cs

@@ -0,0 +1,100 @@
+using Microsoft.EntityFrameworkCore;
+using NotZune.Application.Interfaces;
+using NotZune.Domain.Models;
+
+namespace NotZune.Infrastructure.Persistence;
+
+/// <summary>
+/// SQLite-backed video library with recursive folder scanning (VIDEOLIBRARY parity).
+/// </summary>
+public sealed class VideoLibraryService : IVideoLibraryService
+{
+    private static readonly HashSet<string> VideoExtensions = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ".mp4", ".m4v", ".mkv", ".avi", ".mov", ".wmv", ".webm", ".mpg", ".mpeg", ".ts"
+    };
+
+    private readonly IDbContextFactory<AppDbContext> _contextFactory;
+
+    public VideoLibraryService(IDbContextFactory<AppDbContext> contextFactory)
+    {
+        _contextFactory = contextFactory;
+    }
+
+    public async Task<IReadOnlyList<Video>> GetAllVideosAsync()
+    {
+        await using var ctx = await _contextFactory.CreateDbContextAsync();
+        var videos = await ctx.Videos.OrderBy(v => v.Title).ToListAsync();
+        return videos;
+    }
+
+    public async Task ScanDirectoryAsync(string directoryPath, IProgress<double>? progress = null)
+    {
+        if (!Directory.Exists(directoryPath))
+        {
+            return;
+        }
+
+        var files = Directory.EnumerateFiles(directoryPath, "*", SearchOption.AllDirectories)
+            .Where(f => VideoExtensions.Contains(Path.GetExtension(f)))
+            .ToList();
+
+        var added = 0;
+        await using var ctx = await _contextFactory.CreateDbContextAsync();
+        var existingPaths = (await ctx.Videos.ToListAsync()).Select(v => v.FilePath).ToHashSet(StringComparer.OrdinalIgnoreCase);
+
+        for (var i = 0; i < files.Count; i++)
+        {
+            var file = files[i];
+            if (existingPaths.Contains(file))
+            {
+                continue;
+            }
+
+            var video = new Video
+            {
+                Title = Path.GetFileNameWithoutExtension(file),
+                FilePath = file,
+                SizeBytes = new FileInfo(file).Length,
+                AddedAtUtc = DateTime.UtcNow
+            };
+
+            try
+            {
+                using var tagFile = TagLib.File.Create(file);
+                if (tagFile.Properties?.Duration.TotalMilliseconds > 0)
+                {
+                    video.Duration = tagFile.Properties.Duration;
+                }
+            }
+            catch
+            {
+                // Unsupported containers (e.g. mkv) simply keep a zero duration until played.
+            }
+
+            ctx.Videos.Add(video);
+            added++;
+
+            if (added % 10 == 0)
+            {
+                await ctx.SaveChangesAsync();
+                progress?.Report(files.Count == 0 ? 1.0 : (double)i / files.Count);
+            }
+        }
+
+        await ctx.SaveChangesAsync();
+        progress?.Report(1.0);
+    }
+
+    public async Task MarkPlayedAsync(Guid videoId)
+    {
+        await using var ctx = await _contextFactory.CreateDbContextAsync();
+        var video = await ctx.Videos.FindAsync(videoId);
+        if (video != null)
+        {
+            video.PlayCount++;
+            video.LastPlayedAtUtc = DateTime.UtcNow;
+            await ctx.SaveChangesAsync();
+        }
+    }
+}

src/NotZune.Infrastructure.Video/NotZune.Infrastructure.Video.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <ItemGroup>
+    <ProjectReference Include="..\NotZune.Domain\NotZune.Domain.csproj" />
+    <ProjectReference Include="..\NotZune.Application\NotZune.Application.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="LibVLCSharp" Version="3.9.5" />
+    <PackageReference Include="LibVLCSharp.Avalonia" Version="3.9.5" />
+    <PackageReference Include="VideoLAN.LibVLC.Windows" Version="3.0.23.1" />
+    <PackageReference Include="TagLibSharp" Version="2.3.0" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

src/NotZune.Infrastructure.Video/VideoNativeResolver.cs

@@ -0,0 +1,77 @@
+using System.Runtime.InteropServices;
+
+namespace NotZune.Infrastructure.Video;
+
+/// <summary>
+/// Resolves libvlc/libvlccore DllImports to system-installed VLC 3.x libraries on Linux
+/// (distros ship versioned sonames like libvlc.so.5 without an unversioned symlink).
+/// On Windows the VideoLAN.LibVLC.Windows package ships natives next to the app, so the
+/// default probing already succeeds.
+/// </summary>
+public static class VideoNativeResolver
+{
+    private static bool _registered;
+    private static readonly object Gate = new();
+
+    public static void Register()
+    {
+        lock (Gate)
+        {
+            if (_registered || !OperatingSystem.IsLinux())
+            {
+                _registered = true;
+                return;
+            }
+
+            _registered = true;
+
+            try
+            {
+                NativeLibrary.SetDllImportResolver(typeof(LibVLCSharp.Shared.LibVLC).Assembly, Resolve);
+            }
+            catch
+            {
+                // Resolver registration is best-effort; default probing may still succeed.
+            }
+        }
+    }
+
+    private static IntPtr Resolve(string libraryName, System.Reflection.Assembly assembly, DllImportSearchPath? searchPath)
+    {
+        if (libraryName != "libvlc" && libraryName != "libvlccore")
+        {
+            return IntPtr.Zero;
+        }
+
+        foreach (var candidate in CandidatePaths(libraryName))
+        {
+            if (NativeLibrary.TryLoad(candidate, out var handle))
+            {
+                return handle;
+            }
+        }
+
+        return IntPtr.Zero;
+    }
+
+    private static IEnumerable<string> CandidatePaths(string libraryName)
+    {
+        var isCore = libraryName == "libvlccore";
+        var versioned = isCore ? "libvlccore.so.9" : "libvlc.so.5";
+        var architectures = new[]
+        {
+            Environment.Is64BitProcess ? "x86_64-linux-gnu" : "i386-linux-gnu",
+            Environment.Is64BitProcess ? "x86_64" : "i686",
+            "aarch64-linux-gnu"
+        };
+
+        foreach (var arch in architectures)
+        {
+            yield return $"/usr/lib/{arch}/{versioned}";
+        }
+
+        yield return $"/lib64/{versioned}";
+        yield return $"/usr/lib64/{versioned}";
+        yield return $"/usr/lib/{versioned}";
+    }
+}

src/NotZune.Infrastructure.Video/VideoPlaybackEngine.cs

@@ -0,0 +1,207 @@
+using System.Runtime.InteropServices;
+using LibVLCSharp.Shared;
+using NotZune.Application.Interfaces;
+
+namespace NotZune.Infrastructure.Video;
+
+/// <summary>
+/// Real video playback engine built on libVLC (VLC 3.x).
+/// Natives: bundled via VideoLAN.LibVLC.Windows on Windows; resolved from the system
+/// installation on Linux via <see cref="VideoNativeResolver"/>.
+/// Degrades gracefully to <see cref="IsAvailable"/> = false when libVLC is missing.
+/// </summary>
+public sealed class VideoPlaybackEngine : IVideoPlaybackEngine
+{
+    private static bool _resolverRegistered;
+
+    private readonly object _gate = new();
+    private LibVLC? _libVlc;
+    private MediaPlayer? _mediaPlayer;
+    private bool _initialized;
+    private bool _disposed;
+
+    public bool IsAvailable { get; private set; }
+
+    /// <summary>The LibVLCSharp MediaPlayer, for Avalonia VideoView binding. Null when unavailable.</summary>
+    public object? MediaPlayerHandle => IsAvailable ? _mediaPlayer : null;
+
+    public event EventHandler? PlaybackEnded;
+
+    public VideoPlaybackEngine()
+    {
+        RegisterResolver();
+    }
+
+    private static void RegisterResolver()
+    {
+        if (_resolverRegistered)
+        {
+            return;
+        }
+
+        _resolverRegistered = true;
+        VideoNativeResolver.Register();
+    }
+
+    private bool EnsureInitialized()
+    {
+        if (_initialized)
+        {
+            return IsAvailable;
+        }
+
+        _initialized = true;
+        try
+        {
+            _libVlc = new LibVLC(enableDebugLogs: false, "--no-video-title-show", "--no-snapshot-preview");
+            _mediaPlayer = new MediaPlayer(_libVlc);
+            _mediaPlayer.EndReached += (_, _) => PlaybackEnded?.Invoke(this, EventArgs.Empty);
+            IsAvailable = true;
+        }
+        catch (Exception)
+        {
+            // libVLC natives missing (e.g. Linux without VLC installed) — degrade silently.
+            IsAvailable = false;
+            _libVlc = null;
+            _mediaPlayer = null;
+        }
+
+        return IsAvailable;
+    }
+
+    public void LoadAndPlay(string filePath)
+    {
+        if (!EnsureInitialized() || _mediaPlayer == null || _libVlc == null || string.IsNullOrWhiteSpace(filePath))
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            using var media = new Media(_libVlc, new Uri(filePath));
+            _mediaPlayer.Play(media);
+        }
+    }
+
+    public void Play()
+    {
+        if (!IsAvailable || _mediaPlayer == null)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            _mediaPlayer.Play();
+        }
+    }
+
+    public void Pause()
+    {
+        if (!IsAvailable || _mediaPlayer == null)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            _mediaPlayer.Pause();
+        }
+    }
+
+    public void Stop()
+    {
+        if (!IsAvailable || _mediaPlayer == null)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            _mediaPlayer.Stop();
+        }
+    }
+
+    public void SetVolume(double volume, bool muted)
+    {
+        if (!IsAvailable || _mediaPlayer == null)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            _mediaPlayer.Volume = muted ? 0 : (int)Math.Clamp(volume * 100, 0, 100);
+        }
+    }
+
+    public void Seek(TimeSpan position)
+    {
+        if (!IsAvailable || _mediaPlayer == null)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            if (_mediaPlayer.Time >= 0)
+            {
+                _mediaPlayer.Time = (long)Math.Max(0, position.TotalMilliseconds);
+            }
+        }
+    }
+
+    public TimeSpan GetPosition()
+    {
+        if (!IsAvailable || _mediaPlayer == null)
+        {
+            return TimeSpan.Zero;
+        }
+
+        lock (_gate)
+        {
+            var ms = _mediaPlayer.Time;
+            return ms < 0 ? TimeSpan.Zero : TimeSpan.FromMilliseconds(ms);
+        }
+    }
+
+    public TimeSpan GetDuration()
+    {
+        if (!IsAvailable || _mediaPlayer == null)
+        {
+            return TimeSpan.Zero;
+        }
+
+        lock (_gate)
+        {
+            var ms = _mediaPlayer.Length;
+            return ms <= 0 ? TimeSpan.Zero : TimeSpan.FromMilliseconds(ms);
+        }
+    }
+
+    public void Dispose()
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        _disposed = true;
+        try
+        {
+            lock (_gate)
+            {
+                _mediaPlayer?.Stop();
+                _mediaPlayer?.Dispose();
+                _mediaPlayer = null;
+                _libVlc?.Dispose();
+                _libVlc = null;
+            }
+        }
+        catch
+        {
+        }
+
+        GC.SuppressFinalize(this);
+    }
+}

src/NotZune.UI/Converters/ArtworkSourceConverter.cs

@@ -16,6 +16,9 @@ public class ArtworkSourceConverter : IValueConverter
 {
     public static readonly ArtworkSourceConverter Instance = new();
 
+    /// <summary>High-resolution variant for photo zoom/slideshow surfaces.</summary>
+    public static readonly ArtworkSourceConverter Large = new() { DecodeWidth = 1600 };
+
     public int DecodeWidth { get; set; } = 300;
 
     public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)

src/NotZune.UI/Converters/ObjectToMediaPlayerConverter.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+using LibVLCSharp.Shared;
+
+namespace NotZune.UI.Converters;
+
+/// <summary>
+/// Casts the engine's MediaPlayerHandle (object) to the LibVLCSharp.MediaPlayer
+/// that the LibVLCSharp.Avalonia VideoView control binds to.
+/// </summary>
+public class ObjectToMediaPlayerConverter : IValueConverter
+{
+    public static readonly ObjectToMediaPlayerConverter Instance = new();
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        return value as MediaPlayer;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}

src/NotZune.UI/Converters/PhotoFolderPathConverter.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Globalization;
+using System.IO;
+using Avalonia.Data.Converters;
+
+namespace NotZune.UI.Converters;
+
+/// <summary>
+/// Renders the photo folder tree entries: the sentinel shows "All Photos",
+/// other entries show the folder's display name.
+/// </summary>
+public class PhotoFolderPathConverter : IValueConverter
+{
+    public static readonly PhotoFolderPathConverter Instance = new();
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is not string path)
+        {
+            return string.Empty;
+        }
+
+        return path == NotZune.UI.ViewModels.PhotoLibraryViewModel.AllFoldersEntry
+            ? "All Photos"
+            : Path.GetFileName(path.TrimEnd(Path.DirectorySeparatorChar));
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}

src/NotZune.UI/NotZune.UI.csproj

@@ -7,6 +7,7 @@
     <ProjectReference Include="..\NotZune.Infrastructure.Audio\NotZune.Infrastructure.Audio.csproj" />
     <ProjectReference Include="..\NotZune.Infrastructure.Devices\NotZune.Infrastructure.Devices.csproj" />
     <ProjectReference Include="..\NotZune.Infrastructure.External\NotZune.Infrastructure.External.csproj" />
+    <ProjectReference Include="..\NotZune.Infrastructure.Video\NotZune.Infrastructure.Video.csproj" />
     <ProjectReference Include="..\NotZune.Plugins.Sdk\NotZune.Plugins.Sdk.csproj" />
   </ItemGroup>
 

src/NotZune.UI/ViewLocator.cs

@@ -23,6 +23,9 @@ public class ViewLocator : IDataTemplate
             MainShellViewModel => new MainShellView(),
             ZuneCardViewModel => new ZuneCardView(),
             PodcastsViewModel => new PodcastsView(),
+            PlaylistsViewModel => new PlaylistsView(),
+            VideoLibraryViewModel => new VideoLibraryView(),
+            PhotoLibraryViewModel => new PhotoLibraryView(),
             CDViewModel => new CDView(),
             _ => FindViewByConvention(data)
         };

src/NotZune.UI/ViewModels/CollectionViewModel.cs

@@ -14,7 +14,9 @@ public enum CollectionSubPivot
     Songs,
     Genres,
     Podcasts,
-    Playlists
+    Playlists,
+    Videos,
+    Pictures
 }
 
 public class CollectionViewModel : ViewModelBase
@@ -48,6 +50,8 @@ public class CollectionViewModel : ViewModelBase
 
     public PodcastsViewModel PodcastsVM { get; }
     public PlaylistsViewModel PlaylistsVM { get; }
+    public VideoLibraryViewModel VideoVM { get; }
+    public PhotoLibraryViewModel PhotoVM { get; }
 
     public ObservableCollection<Artist> Artists { get; } = new();
     public ObservableCollection<Album> Albums { get; } = new();
@@ -69,6 +73,8 @@ public class CollectionViewModel : ViewModelBase
                 OnPropertyChanged(nameof(IsGenresActive));
                 OnPropertyChanged(nameof(IsPodcastsActive));
                 OnPropertyChanged(nameof(IsPlaylistsActive));
+                OnPropertyChanged(nameof(IsVideosActive));
+                OnPropertyChanged(nameof(IsPicturesActive));
             }
         }
     }
@@ -79,6 +85,8 @@ public class CollectionViewModel : ViewModelBase
     public bool IsGenresActive => _activeSubPivot == CollectionSubPivot.Genres;
     public bool IsPodcastsActive => _activeSubPivot == CollectionSubPivot.Podcasts;
     public bool IsPlaylistsActive => _activeSubPivot == CollectionSubPivot.Playlists;
+    public bool IsVideosActive => _activeSubPivot == CollectionSubPivot.Videos;
+    public bool IsPicturesActive => _activeSubPivot == CollectionSubPivot.Pictures;
 
     public Artist? SelectedArtist
     {
@@ -138,6 +146,21 @@ public class CollectionViewModel : ViewModelBase
 
     public bool IsEditMetadataOpen => ActiveEditMetadataVM != null;
 
+    private PhotoSlideshowViewModel? _activeSlideshowVM;
+    public PhotoSlideshowViewModel? ActiveSlideshowVM
+    {
+        get => _activeSlideshowVM;
+        set
+        {
+            if (SetProperty(ref _activeSlideshowVM, value))
+            {
+                OnPropertyChanged(nameof(IsSlideshowOpen));
+            }
+        }
+    }
+
+    public bool IsSlideshowOpen => ActiveSlideshowVM != null;
+
     private string? _findAlbumInfoStatusText;
     public string? FindAlbumInfoStatusText
     {
@@ -162,7 +185,10 @@ public class CollectionViewModel : ViewModelBase
         ISmartDJService? smartDJService = null,
         IArtworkCacheService? artworkCache = null,
         IExternalMetadataService? metadataService = null,
-        ISmartPlaylistService? smartPlaylistService = null)
+        ISmartPlaylistService? smartPlaylistService = null,
+        IVideoLibraryService? videoLibraryService = null,
+        IVideoPlaybackEngine? videoEngine = null,
+        IPhotoLibraryService? photoLibraryService = null)
     {
         _playerCoordinator = playerCoordinator;
         _libraryService = libraryService;
@@ -171,6 +197,18 @@ public class CollectionViewModel : ViewModelBase
         _metadataService = metadataService;
         var podService = podcastService ?? new NotZune.Application.Services.PodcastService(playerCoordinator);
         PodcastsVM = new PodcastsViewModel(podService);
+        VideoVM = new VideoLibraryViewModel(
+            videoLibraryService ?? new NotZune.Application.Services.EmptyVideoLibraryService(),
+            videoEngine ?? new NotZune.Application.Services.UnavailableVideoPlaybackEngine());
+        PhotoVM = new PhotoLibraryViewModel(
+            photoLibraryService ?? new NotZune.Application.Services.EmptyPhotoLibraryService());
+        PhotoVM.SlideshowRequested += (_, photo) =>
+        {
+            var startIndex = photo != null ? PhotoVM.GalleryPhotos.IndexOf(photo) : 0;
+            var slideshow = new PhotoSlideshowViewModel(PhotoVM.GalleryPhotos, Math.Max(0, startIndex));
+            slideshow.RequestClose += (_, _) => ActiveSlideshowVM = null;
+            ActiveSlideshowVM = slideshow;
+        };
         PlaylistsVM = new PlaylistsViewModel(libraryService, playerCoordinator, smartPlaylistService);
 
         OpenEditMetadataCommand = new RelayCommand<Track>(track =>

src/NotZune.UI/ViewModels/MainShellViewModel.cs

@@ -347,7 +347,10 @@ public class MainShellViewModel : ViewModelBase
         IArtworkCacheService? artworkCacheService = null,
         IExternalMetadataService? metadataService = null,
         IAudioOutputEngine? audioEngine = null,
-        ISmartPlaylistService? smartPlaylistService = null)
+        ISmartPlaylistService? smartPlaylistService = null,
+        IVideoLibraryService? videoLibraryService = null,
+        IVideoPlaybackEngine? videoEngine = null,
+        IPhotoLibraryService? photoLibraryService = null)
     {
         _playerCoordinator = playerCoordinator;
         _libraryService = libraryService;
@@ -358,8 +361,8 @@ public class MainShellViewModel : ViewModelBase
 
         // Child ViewModels
         QuickplayVM = new QuickplayViewModel(playerCoordinator, libraryService, smartDJService);
-        CollectionVM = new CollectionViewModel(playerCoordinator, libraryService, podService, smartDJService, artworkCacheService, metadataService, smartPlaylistService);
+        CollectionVM = new CollectionViewModel(playerCoordinator, libraryService, podService, smartDJService, artworkCacheService, metadataService, smartPlaylistService, videoLibraryService, videoEngine, photoLibraryService);
-        NowPlayingVM = new NowPlayingViewModel(playerCoordinator, libraryService, enrichmentService, audioEngine);
+        NowPlayingVM = new NowPlayingViewModel(playerCoordinator, libraryService, enrichmentService, audioEngine, videoLibraryService, videoEngine);
         DeviceVM = new DeviceViewModel(deviceSyncService, libraryService);
         SettingsVM = new SettingsViewModel(_soundEffectService, folderPickerService, _libraryService, playerCoordinator, deviceSyncService, settingsStore);
 

src/NotZune.UI/ViewModels/NowPlayingViewModel.cs

@@ -17,7 +17,8 @@ namespace NotZune.UI.ViewModels;
 public enum NowPlayingMode
 {
     ArtistCanvas,
-    MosaicWall
+    MosaicWall,
+    Video
 }
 
 public class NowPlayingViewModel : ViewModelBase
@@ -99,12 +100,92 @@ public class NowPlayingViewModel : ViewModelBase
             {
                 OnPropertyChanged(nameof(IsArtistCanvasMode));
                 OnPropertyChanged(nameof(IsMosaicWallMode));
+                OnPropertyChanged(nameof(IsVideoMode));
+
+                if (value == NowPlayingMode.Video)
+                {
+                    _ = LoadLibraryVideosAsync();
+                }
             }
         }
     }
 
     public bool IsArtistCanvasMode => _mode == NowPlayingMode.ArtistCanvas;
     public bool IsMosaicWallMode => _mode == NowPlayingMode.MosaicWall;
+    public bool IsVideoMode => _mode == NowPlayingMode.Video;
+
+    private readonly IVideoLibraryService? _videoLibraryService;
+    private readonly IVideoPlaybackEngine? _videoEngine;
+
+    public ObservableCollection<Video> LibraryVideos { get; } = new();
+
+    private Video? _selectedVideo;
+    public Video? SelectedVideo
+    {
+        get => _selectedVideo;
+        set
+        {
+            if (SetProperty(ref _selectedVideo, value))
+            {
+                OpenVideoPlayback();
+            }
+        }
+    }
+
+    private VideoPlaybackViewModel? _videoPlaybackVM;
+    public VideoPlaybackViewModel? VideoPlaybackVM
+    {
+        get => _videoPlaybackVM;
+        private set
+        {
+            if (SetProperty(ref _videoPlaybackVM, value))
+            {
+                OnPropertyChanged(nameof(HasVideoPlayback));
+            }
+        }
+    }
+
+    public bool HasVideoPlayback => VideoPlaybackVM != null;
+
+    private async System.Threading.Tasks.Task LoadLibraryVideosAsync()
+    {
+        if (_videoLibraryService == null)
+        {
+            return;
+        }
+
+        try
+        {
+            var videos = await _videoLibraryService.GetAllVideosAsync();
+            LibraryVideos.Clear();
+            foreach (var v in videos)
+            {
+                LibraryVideos.Add(v);
+            }
+
+            if (_selectedVideo == null && LibraryVideos.Count > 0)
+            {
+                SelectedVideo = LibraryVideos[0];
+            }
+        }
+        catch (Exception)
+        {
+            // Video library is best-effort inside Now Playing.
+        }
+    }
+
+    private void OpenVideoPlayback()
+    {
+        if (_videoEngine == null || _selectedVideo == null)
+        {
+            VideoPlaybackVM = null;
+            return;
+        }
+
+        var playback = new VideoPlaybackViewModel(_videoEngine, _selectedVideo);
+        playback.Start();
+        VideoPlaybackVM = playback;
+    }
 
     public bool IsHudVisible
     {
@@ -176,12 +257,16 @@ public class NowPlayingViewModel : ViewModelBase
         IPlayerCoordinator playerCoordinator,
         IMediaLibraryService libraryService,
         IArtistEnrichmentService? enrichmentService = null,
-        IAudioOutputEngine? audioEngine = null)
+        IAudioOutputEngine? audioEngine = null,
+        IVideoLibraryService? videoLibraryService = null,
+        IVideoPlaybackEngine? videoEngine = null)
     {
         _playerCoordinator = playerCoordinator;
         _libraryService = libraryService;
         _enrichmentService = enrichmentService;
         _audioEngine = audioEngine;
+        _videoLibraryService = videoLibraryService;
+        _videoEngine = videoEngine;
 
         _activeBackdrops = new List<string>(_themeBackdrops);
         _currentBackdropImage = _activeBackdrops[0];
@@ -266,7 +351,12 @@ public class NowPlayingViewModel : ViewModelBase
 
         ToggleModeCommand = new RelayCommand(() =>
         {
-            Mode = Mode == NowPlayingMode.ArtistCanvas ? NowPlayingMode.MosaicWall : NowPlayingMode.ArtistCanvas;
+            Mode = Mode switch
+            {
+                NowPlayingMode.ArtistCanvas => NowPlayingMode.MosaicWall,
+                NowPlayingMode.MosaicWall => NowPlayingMode.Video,
+                _ => NowPlayingMode.ArtistCanvas
+            };
         });
 
         ToggleBioDrawerCommand = new RelayCommand(() =>

src/NotZune.UI/ViewModels/PhotoLibraryViewModel.cs

@@ -0,0 +1,172 @@
+using System;
+using System.Collections.ObjectModel;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+using NotZune.Application.Interfaces;
+using NotZune.Domain.Models;
+
+namespace NotZune.UI.ViewModels;
+
+/// <summary>
+/// Photo library browser with folder tree + gallery grid (PHOTOLIBRARY / GALLERYVIEW parity).
+/// </summary>
+public class PhotoLibraryViewModel : ViewModelBase
+{
+    private readonly IPhotoLibraryService _photoLibraryService;
+
+    public ObservableCollection<Photo> AllPhotos { get; } = new();
+    public ObservableCollection<Photo> GalleryPhotos { get; } = new();
+    public ObservableCollection<string> Folders { get; } = new();
+
+    private string? _selectedFolder;
+    public string? SelectedFolder
+    {
+        get => _selectedFolder;
+        set
+        {
+            if (SetProperty(ref _selectedFolder, value))
+            {
+                ApplyFolderFilter();
+                OnPropertyChanged(nameof(SelectedFolderName));
+                OnPropertyChanged(nameof(GalleryStatsText));
+            }
+        }
+    }
+
+    public string SelectedFolderName => SelectedFolder == AllFoldersEntry ? "All Photos" : Path.GetFileName(SelectedFolder ?? string.Empty);
+
+    private Photo? _zoomedPhoto;
+    public Photo? ZoomedPhoto
+    {
+        get => _zoomedPhoto;
+        set
+        {
+            if (SetProperty(ref _zoomedPhoto, value))
+            {
+                OnPropertyChanged(nameof(IsZoomOpen));
+            }
+        }
+    }
+
+    public bool IsZoomOpen => ZoomedPhoto != null;
+
+    private bool _isScanning;
+    public bool IsScanning
+    {
+        get => _isScanning;
+        set => SetProperty(ref _isScanning, value);
+    }
+
+    private string? _statusText;
+    public string? StatusText
+    {
+        get => _statusText;
+        set => SetProperty(ref _statusText, value);
+    }
+
+    public const string AllFoldersEntry = "<<all>>";
+
+    public event EventHandler<Photo>? SlideshowRequested;
+
+    public ICommand ZoomPhotoCommand { get; }
+    public ICommand CloseZoomCommand { get; }
+    public ICommand StartSlideshowCommand { get; }
+    public ICommand ScanFolderCommand { get; }
+
+    public PhotoLibraryViewModel(IPhotoLibraryService photoLibraryService)
+    {
+        _photoLibraryService = photoLibraryService;
+
+        ZoomPhotoCommand = new RelayCommand<Photo>(p => ZoomedPhoto = p);
+        CloseZoomCommand = new RelayCommand(() => ZoomedPhoto = null);
+        StartSlideshowCommand = new RelayCommand(OnStartSlideshow);
+        ScanFolderCommand = new AsyncRelayCommand<string>(OnScanFolderAsync);
+
+        _ = LoadPhotosAsync();
+    }
+
+    public async Task LoadPhotosAsync()
+    {
+        var photos = await _photoLibraryService.GetAllPhotosAsync();
+        AllPhotos.Clear();
+        foreach (var p in photos)
+        {
+            AllPhotos.Add(p);
+        }
+
+        var folders = await _photoLibraryService.GetFoldersAsync();
+        Folders.Clear();
+        Folders.Add(AllFoldersEntry);
+        foreach (var f in folders)
+        {
+            Folders.Add(f);
+        }
+
+        if (SelectedFolder == null || Folders.All(f => f != SelectedFolder))
+        {
+            SelectedFolder = AllFoldersEntry;
+        }
+        else
+        {
+            ApplyFolderFilter();
+        }
+    }
+
+    private void ApplyFolderFilter()
+    {
+        GalleryPhotos.Clear();
+        foreach (var p in SelectedFolder == null || SelectedFolder == AllFoldersEntry
+            ? AllPhotos
+            : AllPhotos.Where(p => p.FolderPath == SelectedFolder))
+        {
+            GalleryPhotos.Add(p);
+        }
+
+        OnPropertyChanged(nameof(GalleryStatsText));
+        OnPropertyChanged(nameof(HasNoPhotos));
+        OnPropertyChanged(nameof(CanStartSlideshow));
+    }
+
+    public string GalleryStatsText => $"{GalleryPhotos.Count} photo{((GalleryPhotos.Count == 1) ? string.Empty : "s")}";
+
+    public bool HasNoPhotos => GalleryPhotos.Count == 0;
+
+    public bool CanStartSlideshow => GalleryPhotos.Count > 0;
+
+    private void OnStartSlideshow()
+    {
+        if (GalleryPhotos.Count > 0)
+        {
+            SlideshowRequested?.Invoke(this, GalleryPhotos[0]);
+        }
+    }
+
+    private async Task OnScanFolderAsync(string? folderPath)
+    {
+        if (string.IsNullOrWhiteSpace(folderPath) || !Directory.Exists(folderPath))
+        {
+            StatusText = "Enter or select a valid folder to scan for pictures.";
+            return;
+        }
+
+        IsScanning = true;
+        StatusText = $"Scanning {folderPath} for pictures...";
+        try
+        {
+            await _photoLibraryService.ScanDirectoryAsync(folderPath);
+            await LoadPhotosAsync();
+            StatusText = $"Picture library scan complete — {AllPhotos.Count} photos.";
+        }
+        catch (Exception ex)
+        {
+            StatusText = $"Picture scan failed: {ex.Message}";
+        }
+        finally
+        {
+            IsScanning = false;
+        }
+    }
+}

src/NotZune.UI/ViewModels/PhotoSlideshowViewModel.cs

@@ -0,0 +1,155 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Timers;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+using NotZune.Domain.Models;
+
+namespace NotZune.UI.ViewModels;
+
+/// <summary>
+/// Full-bleed photo slideshow with slow Ken-Burns drift and transport
+/// (SLIDESHOWLAND / PHOTOSLIDESHOW parity, authentic SLIDESHOW.* transport assets).
+/// </summary>
+public class PhotoSlideshowViewModel : ViewModelBase
+{
+    private static readonly Random _random = new();
+
+    private readonly System.Timers.Timer _advanceTimer;
+
+    public ObservableCollection<Photo> Photos { get; }
+
+    private int _index;
+    private Photo? _currentPhoto;
+    public Photo? CurrentPhoto
+    {
+        get => _currentPhoto;
+        private set
+        {
+            if (SetProperty(ref _currentPhoto, value))
+            {
+                OnPropertyChanged(nameof(CurrentTitle));
+                OnPropertyChanged(nameof(PositionText));
+            }
+        }
+    }
+
+    private bool _isPlaying = true;
+    public bool IsPlaying
+    {
+        get => _isPlaying;
+        private set
+        {
+            if (SetProperty(ref _isPlaying, value))
+            {
+                OnPropertyChanged(nameof(PlayPauseIcon));
+            }
+        }
+    }
+
+    private double _kenBurnsScale = 1.0;
+    public double KenBurnsScale
+    {
+        get => _kenBurnsScale;
+        set => SetProperty(ref _kenBurnsScale, value);
+    }
+
+    private double _kenBurnsTranslateX;
+    public double KenBurnsTranslateX
+    {
+        get => _kenBurnsTranslateX;
+        set => SetProperty(ref _kenBurnsTranslateX, value);
+    }
+
+    private double _kenBurnsTranslateY;
+    public double KenBurnsTranslateY
+    {
+        get => _kenBurnsTranslateY;
+        set => SetProperty(ref _kenBurnsTranslateY, value);
+    }
+
+    public event EventHandler? RequestClose;
+
+    public PhotoSlideshowViewModel(ObservableCollection<Photo> photos, int startIndex = 0)
+    {
+        Photos = new ObservableCollection<Photo>(photos);
+        if (Photos.Count > 0)
+        {
+            _index = Math.Clamp(startIndex, 0, Photos.Count - 1);
+            CurrentPhoto = Photos[_index];
+            RandomizeKenBurns();
+        }
+
+        _advanceTimer = new System.Timers.Timer(6000) { AutoReset = true };
+        _advanceTimer.Elapsed += (_, _) => Next();
+        if (Photos.Count > 1)
+        {
+            _advanceTimer.Start();
+        }
+
+        NextCommand = new RelayCommand(Next);
+        BackCommand = new RelayCommand(Back);
+        PlayPauseCommand = new RelayCommand(OnPlayPause);
+        CloseCommand = new RelayCommand(OnClose);
+    }
+
+    public string CurrentTitle => CurrentPhoto?.Title ?? "Slideshow";
+    public string PositionText => Photos.Count == 0 ? string.Empty : $"{_index + 1} of {Photos.Count}";
+    public string PlayPauseIcon => IsPlaying ? "PAUSE" : "PLAY";
+
+    public ICommand NextCommand { get; }
+    public ICommand BackCommand { get; }
+    public ICommand PlayPauseCommand { get; }
+    public ICommand CloseCommand { get; }
+
+    private void Next()
+    {
+        if (Photos.Count == 0)
+        {
+            return;
+        }
+
+        _index = (_index + 1) % Photos.Count;
+        CurrentPhoto = Photos[_index];
+        RandomizeKenBurns();
+    }
+
+    private void Back()
+    {
+        if (Photos.Count == 0)
+        {
+            return;
+        }
+
+        _index = (_index - 1 + Photos.Count) % Photos.Count;
+        CurrentPhoto = Photos[_index];
+        RandomizeKenBurns();
+    }
+
+    private void OnPlayPause()
+    {
+        IsPlaying = !IsPlaying;
+        if (IsPlaying)
+        {
+            _advanceTimer.Start();
+        }
+        else
+        {
+            _advanceTimer.Stop();
+        }
+    }
+
+    private void OnClose()
+    {
+        _advanceTimer.Stop();
+        RequestClose?.Invoke(this, EventArgs.Empty);
+    }
+
+    private void RandomizeKenBurns()
+    {
+        KenBurnsScale = 1.0 + (_random.NextDouble() * 0.12);
+        KenBurnsTranslateX = (_random.NextDouble() * 40) - 20;
+        KenBurnsTranslateY = (_random.NextDouble() * 30) - 15;
+    }
+}

src/NotZune.UI/ViewModels/SettingsViewModel.cs

@@ -700,6 +700,39 @@ public class SettingsViewModel : ViewModelBase
         }
     }
 
+    public ObservableCollection<string> MediaSyncRules { get; } = new()
+    {
+        "All Videos & Pictures",
+        "Newest 25 Items",
+        "Nothing (Manual Drag and Drop)"
+    };
+
+    private string _videoSyncRule = "All Videos & Pictures";
+    public string VideoSyncRule
+    {
+        get => _videoSyncRule;
+        set
+        {
+            if (SetProperty(ref _videoSyncRule, value))
+            {
+                SaveCurrentSettings();
+            }
+        }
+    }
+
+    private string _picturesSyncRule = "Newest 25 Items";
+    public string PicturesSyncRule
+    {
+        get => _picturesSyncRule;
+        set
+        {
+            if (SetProperty(ref _picturesSyncRule, value))
+            {
+                SaveCurrentSettings();
+            }
+        }
+    }
+
     private bool _wirelessSyncEnabled = true;
     public bool WirelessSyncEnabled
     {
@@ -889,6 +922,10 @@ public class SettingsViewModel : ViewModelBase
             OnPropertyChanged(nameof(MusicSyncRule));
             _podcastSyncRule = settings.PodcastSyncRule;
             OnPropertyChanged(nameof(PodcastSyncRule));
+            _videoSyncRule = settings.VideoSyncRule;
+            OnPropertyChanged(nameof(VideoSyncRule));
+            _picturesSyncRule = settings.PicturesSyncRule;
+            OnPropertyChanged(nameof(PicturesSyncRule));
             _wirelessSyncEnabled = settings.WirelessSyncEnabled;
             OnPropertyChanged(nameof(WirelessSyncEnabled));
             _networkName = settings.NetworkName;
@@ -963,6 +1000,8 @@ public class SettingsViewModel : ViewModelBase
             SpaceReservationPercent = SpaceReservationPercent,
             MusicSyncRule = MusicSyncRule,
             PodcastSyncRule = PodcastSyncRule,
+            VideoSyncRule = VideoSyncRule,
+            PicturesSyncRule = PicturesSyncRule,
             WirelessSyncEnabled = WirelessSyncEnabled,
             NetworkName = NetworkName,
             SelectedAccentName = SelectedAccent.Name,

src/NotZune.UI/ViewModels/VideoLibraryViewModel.cs

@@ -0,0 +1,143 @@
+using System;
+using System.Collections.ObjectModel;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+using NotZune.Application.Interfaces;
+using NotZune.Domain.Models;
+
+namespace NotZune.UI.ViewModels;
+
+/// <summary>
+/// Video library browser (VIDEOLIBRARY parity).
+/// </summary>
+public class VideoLibraryViewModel : ViewModelBase
+{
+    private readonly IVideoLibraryService _videoLibraryService;
+    private readonly IVideoPlaybackEngine _videoEngine;
+
+    public ObservableCollection<Video> Videos { get; } = new();
+
+    private Video? _selectedVideo;
+    public Video? SelectedVideo
+    {
+        get => _selectedVideo;
+        set
+        {
+            if (SetProperty(ref _selectedVideo, value))
+            {
+                OnPropertyChanged(nameof(HasVideos));
+            }
+        }
+    }
+
+    public bool HasVideos => Videos.Count > 0;
+
+    private bool _isScanning;
+    public bool IsScanning
+    {
+        get => _isScanning;
+        set => SetProperty(ref _isScanning, value);
+    }
+
+    private string? _statusText;
+    public string? StatusText
+    {
+        get => _statusText;
+        set => SetProperty(ref _statusText, value);
+    }
+
+    private VideoPlaybackViewModel? _activePlayerVM;
+    public VideoPlaybackViewModel? ActivePlayerVM
+    {
+        get => _activePlayerVM;
+        set
+        {
+            if (SetProperty(ref _activePlayerVM, value))
+            {
+                OnPropertyChanged(nameof(IsPlayerOpen));
+            }
+        }
+    }
+
+    public bool IsPlayerOpen => ActivePlayerVM != null;
+
+    public ICommand PlayVideoCommand { get; }
+    public ICommand ClosePlayerCommand { get; }
+    public ICommand ScanFolderCommand { get; }
+
+    public VideoLibraryViewModel(IVideoLibraryService videoLibraryService, IVideoPlaybackEngine videoEngine)
+    {
+        _videoLibraryService = videoLibraryService;
+        _videoEngine = videoEngine;
+
+        PlayVideoCommand = new AsyncRelayCommand<Video>(OnPlayVideoAsync);
+        ClosePlayerCommand = new RelayCommand(OnClosePlayer);
+        ScanFolderCommand = new AsyncRelayCommand<string>(OnScanFolderAsync);
+
+        _ = LoadVideosAsync();
+    }
+
+    public async Task LoadVideosAsync()
+    {
+        var videos = await _videoLibraryService.GetAllVideosAsync();
+        Videos.Clear();
+        foreach (var v in videos)
+        {
+            Videos.Add(v);
+        }
+
+        OnPropertyChanged(nameof(HasVideos));
+    }
+
+    private async Task OnPlayVideoAsync(Video? video)
+    {
+        if (video == null)
+        {
+            return;
+        }
+
+        SelectedVideo = video;
+        ActivePlayerVM = new VideoPlaybackViewModel(_videoEngine, video);
+        ActivePlayerVM.RequestClose += async (_, _) =>
+        {
+            ActivePlayerVM = null;
+            await _videoLibraryService.MarkPlayedAsync(video.Id);
+        };
+        ActivePlayerVM.Start();
+    }
+
+    private void OnClosePlayer()
+    {
+        ActivePlayerVM?.CloseCommand.Execute(null);
+        ActivePlayerVM = null;
+    }
+
+    private async Task OnScanFolderAsync(string? folderPath)
+    {
+        if (string.IsNullOrWhiteSpace(folderPath) || !Directory.Exists(folderPath))
+        {
+            StatusText = "Enter or select a valid folder to scan for videos.";
+            return;
+        }
+
+        IsScanning = true;
+        StatusText = $"Scanning {folderPath} for videos...";
+        try
+        {
+            await _videoLibraryService.ScanDirectoryAsync(folderPath);
+            await LoadVideosAsync();
+            StatusText = $"Video library scan complete — {Videos.Count} videos.";
+        }
+        catch (Exception ex)
+        {
+            StatusText = $"Video scan failed: {ex.Message}";
+        }
+        finally
+        {
+            IsScanning = false;
+        }
+    }
+}

src/NotZune.UI/ViewModels/VideoPlaybackViewModel.cs

@@ -0,0 +1,171 @@
+using System;
+using System.Timers;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.Input;
+using NotZune.Application.Interfaces;
+using NotZune.Domain.Models;
+
+namespace NotZune.UI.ViewModels;
+
+/// <summary>
+/// Hosts one playing video (NOWPLAYINGCLIPS / video library playback parity).
+/// The Avalonia VideoView binds to <see cref="MediaPlayerHandle"/>.
+/// </summary>
+public class VideoPlaybackViewModel : ViewModelBase
+{
+    private readonly IVideoPlaybackEngine _engine;
+    private readonly Video? _video;
+    private readonly System.Timers.Timer _positionTimer;
+    private bool _isPlaying;
+    private string? _statusText;
+
+    public event EventHandler? RequestClose;
+
+    public VideoPlaybackViewModel(IVideoPlaybackEngine engine, Video? video)
+    {
+        _engine = engine;
+        _video = video;
+
+        _positionTimer = new System.Timers.Timer(500) { AutoReset = true };
+        _positionTimer.Elapsed += (_, _) => NotifyTimeProperties();
+        _positionTimer.Start();
+
+        PlayPauseCommand = new RelayCommand(OnPlayPause);
+        StopCommand = new RelayCommand(OnStop);
+        CloseCommand = new RelayCommand(OnClose);
+        SeekCommand = new RelayCommand<double>(OnSeek);
+    }
+
+    /// <summary>The live LibVLCSharp.MediaPlayer for the VideoView surface.</summary>
+    public object? MediaPlayerHandle => _engine.MediaPlayerHandle;
+
+    public string VideoTitle => _video?.Title ?? "Video";
+
+    public bool IsVideoAvailable => _engine.IsAvailable && _engine.MediaPlayerHandle != null;
+
+    public string UnavailableText => "Video playback is unavailable on this system. Install VLC (libvlc) and restart Not-Zune to enable video.";
+
+    public string? StatusText
+    {
+        get => _statusText;
+        set => SetProperty(ref _statusText, value);
+    }
+
+    public bool IsPlaying
+    {
+        get => _isPlaying;
+        private set
+        {
+            if (SetProperty(ref _isPlaying, value))
+            {
+                OnPropertyChanged(nameof(PlayPauseIcon));
+            }
+        }
+    }
+
+    public string PlayPauseIcon => IsPlaying ? "⏸" : "▶";
+
+    public TimeSpan Position => _engine.GetPosition();
+
+    public TimeSpan Duration
+    {
+        get
+        {
+            var engineDuration = _engine.GetDuration();
+            if (engineDuration > TimeSpan.Zero)
+            {
+                return engineDuration;
+            }
+
+            return _video?.Duration ?? TimeSpan.Zero;
+        }
+    }
+
+    public double ProgressFraction
+    {
+        get
+        {
+            var total = Duration.TotalMilliseconds;
+            return total <= 0 ? 0 : Math.Clamp(Position.TotalMilliseconds / total, 0, 1);
+        }
+    }
+
+    /// <summary>Two-way scrub target for the seek slider.</summary>
+    public double SeekFraction
+    {
+        get => ProgressFraction;
+        set => OnSeek(Math.Clamp(value, 0, 1));
+    }
+
+    public string TimeText => $"{Position:hh\\:mm\\:ss} / {Duration:hh\\:mm\\:ss}";
+
+    public ICommand PlayPauseCommand { get; }
+    public ICommand StopCommand { get; }
+    public ICommand CloseCommand { get; }
+    public ICommand SeekCommand { get; }
+
+    public void Start()
+    {
+        if (_video == null || !IsVideoAvailable)
+        {
+            StatusText = IsVideoAvailable ? null : UnavailableText;
+            return;
+        }
+
+        _engine.LoadAndPlay(_video.FilePath);
+        _engine.SetVolume(0.8, muted: false);
+        IsPlaying = true;
+        NotifyTimeProperties();
+    }
+
+    private void OnPlayPause()
+    {
+        if (IsPlaying)
+        {
+            _engine.Pause();
+            IsPlaying = false;
+        }
+        else
+        {
+            _engine.Play();
+            IsPlaying = true;
+        }
+    }
+
+    private void OnStop()
+    {
+        _engine.Stop();
+        IsPlaying = false;
+        NotifyTimeProperties();
+    }
+
+    private void OnClose()
+    {
+        _engine.Stop();
+        _positionTimer.Stop();
+        RequestClose?.Invoke(this, EventArgs.Empty);
+    }
+
+    private void OnSeek(double fraction)
+    {
+        var total = Duration.TotalMilliseconds;
+        if (total <= 0)
+        {
+            return;
+        }
+
+        _engine.Seek(TimeSpan.FromMilliseconds(fraction * total));
+    }
+
+    private void NotifyTimeProperties()
+    {
+        OnPropertyChanged(nameof(Position));
+        OnPropertyChanged(nameof(Duration));
+        OnPropertyChanged(nameof(ProgressFraction));
+        OnPropertyChanged(nameof(TimeText));
+        if (IsPlaying && _engine.GetDuration() > TimeSpan.Zero && _engine.GetPosition() >= _engine.GetDuration().Subtract(TimeSpan.FromMilliseconds(250)))
+        {
+            IsPlaying = false;
+        }
+    }
+}

src/NotZune.UI/Views/CollectionView.axaml

@@ -33,6 +33,12 @@
         <Button Command="{Binding SelectSubPivotCommand}" CommandParameter="{x:Static vm:CollectionSubPivot.Playlists}">
           <TextBlock Text="playlists" Classes="subpivot" Classes.active="{Binding IsPlaylistsActive}" />
         </Button>
+        <Button Command="{Binding SelectSubPivotCommand}" CommandParameter="{x:Static vm:CollectionSubPivot.Videos}">
+          <TextBlock Text="videos" Classes="subpivot" Classes.active="{Binding IsVideosActive}" />
+        </Button>
+        <Button Command="{Binding SelectSubPivotCommand}" CommandParameter="{x:Static vm:CollectionSubPivot.Pictures}">
+          <TextBlock Text="pictures" Classes="subpivot" Classes.active="{Binding IsPicturesActive}" />
+        </Button>
       </StackPanel>
 
       <!-- Minimal Search Box -->
@@ -394,6 +400,8 @@
 
       <!-- 6. PLAYLISTS SUB-PIVOT -->
       <ContentControl IsVisible="{Binding IsPlaylistsActive}" Content="{Binding PlaylistsVM}" />
+      <ContentControl IsVisible="{Binding IsVideosActive}" Content="{Binding VideoVM}" />
+      <ContentControl IsVisible="{Binding IsPicturesActive}" Content="{Binding PhotoVM}" />
 
     </Grid>
   </Grid>
@@ -412,5 +420,10 @@
   <Grid IsVisible="{Binding IsTrackMatchReviewOpen}" Background="#D9000000">
     <views:TrackMatchReviewView DataContext="{Binding ActiveTrackMatchReviewVM}" HorizontalAlignment="Center" VerticalAlignment="Center" />
   </Grid>
+
+  <!-- 10. PHOTO SLIDESHOW OVERLAY (SLIDESHOWLAND parity) -->
+  <Panel IsVisible="{Binding IsSlideshowOpen}" Background="Black" ZIndex="120">
+    <views:PhotoSlideshowView DataContext="{Binding ActiveSlideshowVM}" />
+  </Panel>
 </Panel>
 </UserControl>

src/NotZune.UI/Views/NowPlayingView.axaml

@@ -4,6 +4,7 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              xmlns:vm="clr-namespace:NotZune.UI.ViewModels;assembly=NotZune.UI"
              xmlns:models="clr-namespace:NotZune.Domain.Models;assembly=NotZune.Domain"
+             xmlns:views="clr-namespace:NotZune.UI.Views;assembly=NotZune.UI"
              mc:Ignorable="d" d:DesignWidth="1100" d:DesignHeight="700"
              x:Class="NotZune.UI.Views.NowPlayingView"
              x:DataType="vm:NowPlayingViewModel">
@@ -306,10 +307,45 @@
       <Button Command="{Binding ToggleModeCommand}" Classes="zune-action">
         <StackPanel Orientation="Horizontal" Spacing="6">
           <TextBlock Text="⊞" FontSize="12" Foreground="{DynamicResource ZuneAccentBrush}" VerticalAlignment="Center" />
-          <TextBlock Text="WALL / CANVAS" Classes="caption" FontWeight="SemiBold" VerticalAlignment="Center" />
+          <TextBlock Text="WALL / CANVAS / VIDEO" Classes="caption" FontWeight="SemiBold" VerticalAlignment="Center" />
         </StackPanel>
       </Button>
     </StackPanel>
 
+    <!-- MODE 3: NOW PLAYING VIDEO CLIPS (NOWPLAYINGCLIPS parity) -->
+    <Panel IsVisible="{Binding IsVideoMode}" Background="#FF070707">
+      <Grid RowDefinitions="Auto,*" Margin="40,20,40,80">
+        <StackPanel Grid.Row="0" Spacing="10">
+          <TextBlock Text="now playing clips" Classes="hero" FontSize="30" />
+          <Grid ColumnDefinitions="260,*" Margin="0,0,12,0">
+            <ListBox Grid.Column="0"
+                     ItemsSource="{Binding LibraryVideos}"
+                     SelectedItem="{Binding SelectedVideo}"
+                     Background="Transparent"
+                     CornerRadius="0"
+                     MaxHeight="300">
+              <ListBox.ItemTemplate>
+                <DataTemplate x:DataType="models:Video">
+                  <Border Padding="6,8" CornerRadius="0">
+                    <StackPanel Spacing="2">
+                      <TextBlock Text="{Binding Title}" Classes="body" FontWeight="SemiBold" TextTrimming="CharacterEllipsis" />
+                      <TextBlock Text="{Binding Duration, StringFormat='{}{0:hh\\:mm\\:ss}'}" Classes="caption" FontSize="9" Foreground="{DynamicResource ZuneTextDimmedBrush}" />
+                    </StackPanel>
+                  </Border>
+                </DataTemplate>
+              </ListBox.ItemTemplate>
+            </ListBox>
+            <Panel Grid.Column="1">
+              <views:VideoPlaybackView DataContext="{Binding VideoPlaybackVM}" IsVisible="{Binding HasVideoPlayback}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
+              <TextBlock Text="Select a video from your library to play it right here."
+                         Classes="body" Foreground="{DynamicResource ZuneTextDimmedBrush}"
+                         HorizontalAlignment="Center" VerticalAlignment="Center"
+                         IsVisible="{Binding !HasVideoPlayback}" />
+            </Panel>
+          </Grid>
+        </StackPanel>
+      </Grid>
+    </Panel>
+
   </Grid>
 </UserControl>

src/NotZune.UI/Views/PhotoLibraryView.axaml

@@ -0,0 +1,100 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="clr-namespace:NotZune.UI.ViewModels;assembly=NotZune.UI"
+             xmlns:models="clr-namespace:NotZune.Domain.Models;assembly=NotZune.Domain"
+             xmlns:conv="clr-namespace:NotZune.UI.Converters;assembly=NotZune.UI"
+             mc:Ignorable="d" d:DesignWidth="1000" d:DesignHeight="640"
+             x:Class="NotZune.UI.Views.PhotoLibraryView"
+             x:DataType="vm:PhotoLibraryViewModel">
+
+  <Panel>
+    <Grid ColumnDefinitions="240,32,*" Margin="0,16,0,0">
+      <!-- Left: Folder Tree -->
+      <Grid Grid.Column="0" RowDefinitions="Auto,*,Auto,Auto,Auto">
+        <TextBlock Grid.Row="0" Text="folders" Classes="section-header" Margin="0,0,0,8" />
+        <ListBox Grid.Row="1"
+                 ItemsSource="{Binding Folders}"
+                 SelectedItem="{Binding SelectedFolder}"
+                 Background="Transparent"
+                 CornerRadius="0">
+          <ListBox.ItemTemplate>
+            <DataTemplate>
+              <Border Padding="6,7" CornerRadius="0">
+                <TextBlock Text="{Binding Converter={x:Static conv:PhotoFolderPathConverter.Instance}}" Classes="body" TextTrimming="CharacterEllipsis" />
+              </Border>
+            </DataTemplate>
+          </ListBox.ItemTemplate>
+        </ListBox>
+
+        <TextBox Grid.Row="2" Name="PhotoScanPathBox" Watermark="folder to scan (e.g. ~/Pictures)" CornerRadius="0" Margin="0,8,0,0" />
+        <Button Grid.Row="3" Classes="zune-action" Command="{Binding ScanFolderCommand}" CommandParameter="{Binding #PhotoScanPathBox.Text}" Margin="0,8,0,0">
+          <TextBlock Text="SCAN FOR PICTURES" Classes="caption" FontWeight="SemiBold" />
+        </Button>
+        <Button Grid.Row="4" Classes="zune-action" Command="{Binding StartSlideshowCommand}" Margin="0,8,0,0">
+          <StackPanel Orientation="Horizontal" Spacing="6">
+            <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/SLIDESHOW.PLAY.PNG" Width="16" Height="16" />
+            <TextBlock Text="START SLIDESHOW" Classes="caption" FontWeight="SemiBold" />
+          </StackPanel>
+        </Button>
+      </Grid>
+
+      <!-- Right: Gallery Grid -->
+      <Grid Grid.Column="2" RowDefinitions="Auto,*">
+        <StackPanel Grid.Row="0" Spacing="4">
+          <TextBlock Text="pictures" Classes="hero" />
+          <TextBlock Text="{Binding GalleryStatsText}" Classes="caption" Foreground="{DynamicResource ZuneTextSecondaryBrush}" />
+          <TextBlock Text="{Binding StatusText}" Classes="caption" Foreground="{DynamicResource ZuneAccentBrush}" IsVisible="{Binding StatusText, Converter={x:Static ObjectConverters.IsNotNull}}" />
+        </StackPanel>
+
+        <ScrollViewer Grid.Row="1" Margin="0,12,0,0">
+          <Panel>
+            <ItemsControl ItemsSource="{Binding GalleryPhotos}">
+              <ItemsControl.ItemsPanel>
+                <ItemsPanelTemplate>
+                  <WrapPanel Orientation="Horizontal" />
+                </ItemsPanelTemplate>
+              </ItemsControl.ItemsPanel>
+              <ItemsControl.ItemTemplate>
+                <DataTemplate DataType="models:Photo">
+                  <Button Command="{Binding $parent[UserControl].((vm:PhotoLibraryViewModel)DataContext).ZoomPhotoCommand}"
+                          CommandParameter="{Binding}"
+                          Padding="0" Margin="0,0,14,14">
+                    <Border Width="150" Height="150"
+                            Background="{DynamicResource ZuneCardBrush}"
+                            BorderBrush="{DynamicResource ZuneBorderBrush}"
+                            BorderThickness="1"
+                            CornerRadius="0">
+                      <Image Source="{Binding FilePath, Converter={x:Static conv:ArtworkSourceConverter.Instance}}" Stretch="UniformToFill" />
+                    </Border>
+                  </Button>
+                </DataTemplate>
+              </ItemsControl.ItemTemplate>
+            </ItemsControl>
+
+            <StackPanel IsVisible="{Binding HasNoPhotos}" VerticalAlignment="Center" HorizontalAlignment="Center" Spacing="10">
+              <TextBlock Text="no pictures yet" Classes="hero" HorizontalAlignment="Center" />
+              <TextBlock Text="Scan a folder above — JPG, PNG, BMP, GIF and WebP are supported."
+                         Classes="body" Foreground="{DynamicResource ZuneTextSecondaryBrush}" HorizontalAlignment="Center" />
+            </StackPanel>
+          </Panel>
+        </ScrollViewer>
+      </Grid>
+    </Grid>
+
+    <!-- Zoom Overlay -->
+    <Grid IsVisible="{Binding IsZoomOpen}" Background="#F0000000">
+      <Grid RowDefinitions="Auto,*" Margin="24">
+        <Button Grid.Row="0" Command="{Binding CloseZoomCommand}" HorizontalAlignment="Right" Background="Transparent" BorderThickness="0" Padding="6">
+          <TextBlock Text="✕" FontSize="14" Foreground="{DynamicResource ZuneTextDimmedBrush}" />
+        </Button>
+        <Image Grid.Row="1"
+               Source="{Binding ZoomedPhoto.FilePath, Converter={x:Static conv:ArtworkSourceConverter.Large}}"
+               Stretch="Uniform"
+               HorizontalAlignment="Center"
+               VerticalAlignment="Center" />
+      </Grid>
+    </Grid>
+  </Panel>
+</UserControl>

src/NotZune.UI/Views/PhotoLibraryView.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace NotZune.UI.Views;
+
+public partial class PhotoLibraryView : UserControl
+{
+    public PhotoLibraryView()
+    {
+        InitializeComponent();
+    }
+}

src/NotZune.UI/Views/PhotoSlideshowView.axaml

@@ -0,0 +1,59 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="clr-namespace:NotZune.UI.ViewModels;assembly=NotZune.UI"
+             xmlns:conv="clr-namespace:NotZune.UI.Converters;assembly=NotZune.UI"
+             mc:Ignorable="d" d:DesignWidth="1000" d:DesignHeight="660"
+             x:Class="NotZune.UI.Views.PhotoSlideshowView"
+             x:DataType="vm:PhotoSlideshowViewModel">
+
+  <Grid>
+    <!-- Full-bleed photo with Ken-Burns drift -->
+    <Panel Background="Black">
+      <Image Source="{Binding CurrentPhoto.FilePath, Converter={x:Static conv:ArtworkSourceConverter.Large}}"
+             Stretch="Uniform"
+             HorizontalAlignment="Center"
+             VerticalAlignment="Center"
+             RenderTransformOrigin="0.5,0.5">
+        <Image.RenderTransform>
+          <TransformGroup>
+            <ScaleTransform ScaleX="{Binding KenBurnsScale}" ScaleY="{Binding KenBurnsScale}" />
+            <TranslateTransform X="{Binding KenBurnsTranslateX}" Y="{Binding KenBurnsTranslateY}" />
+          </TransformGroup>
+        </Image.RenderTransform>
+      </Image>
+    </Panel>
+
+    <!-- Top overlay: title + close -->
+    <Border VerticalAlignment="Top" Background="#B3000000" Padding="16,8">
+      <Grid ColumnDefinitions="*,Auto">
+        <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="12" VerticalAlignment="Center">
+          <TextBlock Text="{Binding CurrentTitle}" Classes="body" FontWeight="SemiBold" Foreground="{DynamicResource ZuneTextActiveBrush}" />
+          <TextBlock Text="{Binding PositionText}" Classes="caption" Foreground="{DynamicResource ZuneTextDimmedBrush}" VerticalAlignment="Center" />
+        </StackPanel>
+        <Button Grid.Column="1" Command="{Binding CloseCommand}" Background="Transparent" BorderThickness="0" Padding="6">
+          <TextBlock Text="✕" FontSize="14" Foreground="{DynamicResource ZuneTextActiveBrush}" />
+        </Button>
+      </Grid>
+    </Border>
+
+    <!-- Bottom transport (authentic SLIDESHOW.* assets) -->
+    <Border VerticalAlignment="Bottom" Background="#B3000000" Padding="16,10">
+      <StackPanel Orientation="Horizontal" Spacing="16" HorizontalAlignment="Center">
+        <Button Command="{Binding BackCommand}" Background="Transparent" BorderThickness="0" Padding="4">
+          <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/SLIDESHOW.BACK.PNG" Width="24" Height="24" />
+        </Button>
+        <Button Command="{Binding PlayPauseCommand}" Background="Transparent" BorderThickness="0" Padding="4">
+          <Panel>
+            <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/SLIDESHOW.PLAY.PNG" Width="24" Height="24" IsVisible="{Binding !IsPlaying}" />
+            <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/SLIDESHOW.PAUSE.PNG" Width="24" Height="24" IsVisible="{Binding IsPlaying}" />
+          </Panel>
+        </Button>
+        <Button Command="{Binding NextCommand}" Background="Transparent" BorderThickness="0" Padding="4">
+          <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/SLIDESHOW.NEXT.PNG" Width="24" Height="24" />
+        </Button>
+      </StackPanel>
+    </Border>
+  </Grid>
+</UserControl>

src/NotZune.UI/Views/PhotoSlideshowView.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace NotZune.UI.Views;
+
+public partial class PhotoSlideshowView : UserControl
+{
+    public PhotoSlideshowView()
+    {
+        InitializeComponent();
+    }
+}

src/NotZune.UI/Views/SettingsView.axaml

@@ -457,6 +457,24 @@
                       HorizontalAlignment="Left" />
           </StackPanel>
 
+          <StackPanel Spacing="10">
+            <TextBlock Text="VIDEO SYNCHRONIZATION RULE" Classes="section-header" />
+            <ComboBox ItemsSource="{Binding MediaSyncRules}" 
+                      SelectedItem="{Binding VideoSyncRule}" 
+                      CornerRadius="0" 
+                      Width="380" 
+                      HorizontalAlignment="Left" />
+          </StackPanel>
+
+          <StackPanel Spacing="10">
+            <TextBlock Text="PICTURES SYNCHRONIZATION RULE" Classes="section-header" />
+            <ComboBox ItemsSource="{Binding MediaSyncRules}" 
+                      SelectedItem="{Binding PicturesSyncRule}" 
+                      CornerRadius="0" 
+                      Width="380" 
+                      HorizontalAlignment="Left" />
+          </StackPanel>
+
           <StackPanel Spacing="10">
             <TextBlock Text="GUEST &amp; REVERSE SYNC" Classes="section-header" />
             <CheckBox IsChecked="True" 

src/NotZune.UI/Views/VideoLibraryView.axaml

@@ -0,0 +1,84 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="clr-namespace:NotZune.UI.ViewModels;assembly=NotZune.UI"
+             xmlns:models="clr-namespace:NotZune.Domain.Models;assembly=NotZune.Domain"
+             xmlns:views="clr-namespace:NotZune.UI.Views;assembly=NotZune.UI"
+             mc:Ignorable="d" d:DesignWidth="1000" d:DesignHeight="640"
+             x:Class="NotZune.UI.Views.VideoLibraryView"
+             x:DataType="vm:VideoLibraryViewModel">
+
+  <Panel>
+  <Grid RowDefinitions="Auto,Auto,*,Auto" Margin="0,16,0,0">
+
+    <!-- Header -->
+    <StackPanel Grid.Row="0" Spacing="4">
+      <TextBlock Text="videos" Classes="hero" />
+      <TextBlock Text="{Binding StatusText}" Classes="caption" Foreground="{DynamicResource ZuneTextSecondaryBrush}" IsVisible="{Binding StatusText, Converter={x:Static ObjectConverters.IsNotNull}}" />
+    </StackPanel>
+
+    <!-- Scan strip -->
+    <Grid Grid.Row="1" ColumnDefinitions="*,Auto" Margin="0,12,0,12">
+      <TextBox Grid.Column="0" Name="ScanPathBox" Watermark="folder to scan for videos (e.g. ~/Videos)" CornerRadius="0" />
+      <Button Grid.Column="1" Classes="zune-action" Margin="8,0,0,0" Command="{Binding ScanFolderCommand}" CommandParameter="{Binding #ScanPathBox.Text}">
+        <TextBlock Text="SCAN FOR VIDEOS" Classes="caption" FontWeight="SemiBold" />
+      </Button>
+    </Grid>
+
+    <!-- Video Grid -->
+    <ScrollViewer Grid.Row="2">
+      <Panel>
+        <ItemsControl ItemsSource="{Binding Videos}" IsVisible="{Binding HasVideos}">
+          <ItemsControl.ItemsPanel>
+            <ItemsPanelTemplate>
+              <WrapPanel Orientation="Horizontal" />
+            </ItemsPanelTemplate>
+          </ItemsControl.ItemsPanel>
+          <ItemsControl.ItemTemplate>
+            <DataTemplate DataType="models:Video">
+              <Button Command="{Binding $parent[UserControl].((vm:VideoLibraryViewModel)DataContext).PlayVideoCommand}"
+                      CommandParameter="{Binding}"
+                      Padding="0" Margin="0,0,20,20">
+                <Border Background="{DynamicResource ZuneSurfaceElevatedBrush}"
+                        BorderBrush="{DynamicResource ZuneBorderBrush}"
+                        BorderThickness="1"
+                        CornerRadius="0"
+                        Width="210"
+                        Height="170"
+                        Padding="10">
+                  <Grid RowDefinitions="*,Auto,Auto">
+                    <Border Grid.Row="0" Background="{DynamicResource ZuneCardBrush}" CornerRadius="0">
+                      <Grid>
+                        <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/VIDEOOVERLAY.PNG" Width="40" Height="40" HorizontalAlignment="Center" VerticalAlignment="Center" Opacity="0.8" />
+                        <TextBlock Text="▶" FontSize="26" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="{DynamicResource ZuneAccentBrush}" />
+                      </Grid>
+                    </Border>
+                    <TextBlock Grid.Row="1" Text="{Binding Title}" Classes="body" FontWeight="SemiBold" TextTrimming="CharacterEllipsis" Margin="0,8,0,2" />
+                    <TextBlock Grid.Row="2" Text="{Binding Duration, StringFormat='{}{0:hh\\:mm\\:ss}'}" Classes="caption" Foreground="{DynamicResource ZuneTextSecondaryBrush}" />
+                  </Grid>
+                </Border>
+              </Button>
+            </DataTemplate>
+          </ItemsControl.ItemTemplate>
+        </ItemsControl>
+
+        <!-- Empty State -->
+        <StackPanel IsVisible="{Binding !HasVideos}" VerticalAlignment="Center" HorizontalAlignment="Center" Spacing="12">
+          <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/VIDEOS.EMPTY.PNG" Width="64" Height="48" HorizontalAlignment="Center" Opacity="0.6" />
+          <TextBlock Text="no videos yet" Classes="hero" HorizontalAlignment="Center" />
+          <TextBlock Text="Scan a folder above — MP4, MKV, MOV, AVI, WMV and WebM are supported."
+                     Classes="body" Foreground="{DynamicResource ZuneTextSecondaryBrush}" HorizontalAlignment="Center" />
+        </StackPanel>
+      </Panel>
+    </ScrollViewer>
+
+    <TextBlock Grid.Row="3" Text="" />
+  </Grid>
+
+  <!-- Video Player Overlay -->
+  <Grid IsVisible="{Binding IsPlayerOpen}" Background="#E8000000">
+    <views:VideoPlaybackView DataContext="{Binding ActivePlayerVM}" HorizontalAlignment="Center" VerticalAlignment="Center" />
+  </Grid>
+  </Panel>
+</UserControl>

src/NotZune.UI/Views/VideoLibraryView.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace NotZune.UI.Views;
+
+public partial class VideoLibraryView : UserControl
+{
+    public VideoLibraryView()
+    {
+        InitializeComponent();
+    }
+}

src/NotZune.UI/Views/VideoPlaybackView.axaml

@@ -0,0 +1,64 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="clr-namespace:NotZune.UI.ViewModels;assembly=NotZune.UI"
+             xmlns:vlc="clr-namespace:LibVLCSharp.Avalonia;assembly=LibVLCSharp.Avalonia"
+             xmlns:conv="clr-namespace:NotZune.UI.Converters;assembly=NotZune.UI"
+             mc:Ignorable="d" d:DesignWidth="860" d:DesignHeight="540"
+             x:Class="NotZune.UI.Views.VideoPlaybackView"
+             x:DataType="vm:VideoPlaybackViewModel"
+             Width="840">
+  <Border Background="#FF0A0A0A"
+          BorderBrush="{DynamicResource ZuneBorderBrush}"
+          BorderThickness="1"
+          CornerRadius="0"
+          Padding="16">
+    <StackPanel Spacing="12">
+
+      <Grid ColumnDefinitions="*,Auto">
+        <TextBlock Grid.Column="0" Text="{Binding VideoTitle}" Classes="hero" FontSize="22" Foreground="{DynamicResource ZuneTextActiveBrush}" />
+        <Button Grid.Column="1" Command="{Binding CloseCommand}" Background="Transparent" BorderThickness="0" Padding="6">
+          <TextBlock Text="✕" FontSize="14" Foreground="{DynamicResource ZuneTextDimmedBrush}" />
+        </Button>
+      </Grid>
+
+      <!-- Video Surface -->
+      <Border Background="Black" Height="430" CornerRadius="0">
+        <Panel>
+          <vlc:VideoView MediaPlayer="{Binding MediaPlayerHandle, Converter={x:Static conv:ObjectToMediaPlayerConverter.Instance}}" IsVisible="{Binding IsVideoAvailable}" />
+          <TextBlock Text="{Binding UnavailableText}"
+                     Classes="body"
+                     TextWrapping="Wrap"
+                     Foreground="{DynamicResource ZuneTextDimmedBrush}"
+                     HorizontalAlignment="Center"
+                     VerticalAlignment="Center"
+                     Padding="40"
+                     IsVisible="{Binding !IsVideoAvailable}" />
+          <Image Source="avares://NotZune.UI/Assets/Zune/Slideshow/VIDEOOVERLAY.PNG"
+                 Width="72" Height="72"
+                 HorizontalAlignment="Center" VerticalAlignment="Center"
+                 IsVisible="{Binding !IsPlaying}" Opacity="0.7" />
+        </Panel>
+      </Border>
+
+      <!-- Transport -->
+      <StackPanel Spacing="6">
+        <ProgressBar Minimum="0" Maximum="1" Value="{Binding ProgressFraction, Mode=OneWay}" Height="3" CornerRadius="0" Foreground="{DynamicResource ZuneAccentBrush}" Background="#222222" />
+        <Grid ColumnDefinitions="Auto,*,Auto">
+          <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="10" VerticalAlignment="Center">
+            <Button Command="{Binding PlayPauseCommand}" Classes="zune-action">
+              <TextBlock Text="{Binding PlayPauseIcon}" FontSize="14" />
+            </Button>
+            <Button Command="{Binding StopCommand}" Classes="zune-action">
+              <TextBlock Text="⏹" FontSize="13" />
+            </Button>
+            <TextBlock Text="{Binding TimeText}" Classes="caption" VerticalAlignment="Center" Foreground="{DynamicResource ZuneTextSecondaryBrush}" />
+          </StackPanel>
+          <Slider Grid.Column="1" Minimum="0" Maximum="1" Value="{Binding SeekFraction, Mode=TwoWay}" VerticalAlignment="Center" Margin="12,0" />
+          <TextBlock Grid.Column="2" Text="NOW PLAYING — VIDEO" Classes="caption" FontSize="9" LetterSpacing="1" VerticalAlignment="Center" Foreground="{DynamicResource ZuneTextDimmedBrush}" />
+        </Grid>
+      </StackPanel>
+    </StackPanel>
+  </Border>
+</UserControl>

src/NotZune.UI/Views/VideoPlaybackView.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace NotZune.UI.Views;
+
+public partial class VideoPlaybackView : UserControl
+{
+    public VideoPlaybackView()
+    {
+        InitializeComponent();
+    }
+}

tests/NotZune.Tests.Application/VideoPhotoParityTests.cs

@@ -0,0 +1,214 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.EntityFrameworkCore;
+using NotZune.Application.Interfaces;
+using NotZune.Application.Services;
+using NotZune.Domain.Models;
+using NotZune.Infrastructure.Persistence;
+using NotZune.UI.ViewModels;
+using Xunit;
+
+namespace NotZune.Tests.Application;
+
+/// <summary>
+/// Phase 8 parity: video/photo libraries, playback view models, and the slideshow.
+/// </summary>
+public class VideoPhotoParityTests : IDisposable
+{
+    private readonly string _tempDir;
+    private readonly string _dbPath;
+    private readonly IDbContextFactory<AppDbContext> _dbFactory;
+
+    public VideoPhotoParityTests()
+    {
+        _tempDir = Path.Combine(Path.GetTempPath(), $"notzune-video-{Guid.NewGuid():N}");
+        Directory.CreateDirectory(_tempDir);
+        _dbPath = Path.Combine(_tempDir, "test.db");
+        var options = new DbContextOptionsBuilder<AppDbContext>().UseSqlite($"Data Source={_dbPath}").Options;
+        _dbFactory = new TestDbContextFactory(options);
+        using var ctx = _dbFactory.CreateDbContext();
+        ctx.Database.EnsureCreated();
+    }
+
+    public void Dispose()
+    {
+        if (Directory.Exists(_tempDir))
+        {
+            Directory.Delete(_tempDir, recursive: true);
+        }
+    }
+
+    private sealed class TestDbContextFactory : IDbContextFactory<AppDbContext>
+    {
+        private readonly DbContextOptions<AppDbContext> _options;
+        public TestDbContextFactory(DbContextOptions<AppDbContext> options) => _options = options;
+        public AppDbContext CreateDbContext() => new(_options);
+        public async Task<AppDbContext> CreateDbContextAsync(CancellationToken cancellationToken = default) => await Task.FromResult(new AppDbContext(_options));
+    }
+
+    [Fact]
+    public async Task VideoLibrary_Scan_PersistsVideosWithDurationGraceful()
+    {
+        var fakeVideo = Path.Combine(_tempDir, "Sample Movie.mp4");
+        File.WriteAllBytes(fakeVideo, new byte[] { 0x00, 0x00, 0x00, 0x18 }); // container bytes; TagLib will fail gracefully
+        var service = new VideoLibraryService(_dbFactory);
+
+        await service.ScanDirectoryAsync(_tempDir);
+        var videos = await service.GetAllVideosAsync();
+
+        var video = Assert.Single(videos);
+        Assert.Equal("Sample Movie", video.Title);
+        Assert.Equal(fakeVideo, video.FilePath);
+    }
+
+    [Fact]
+    public async Task VideoLibrary_MarkPlayed_IncrementsCount()
+    {
+        var fakeVideo = Path.Combine(_tempDir, "clip.mp4");
+        File.WriteAllBytes(fakeVideo, new byte[] { 0x01 });
+        var service = new VideoLibraryService(_dbFactory);
+        await service.ScanDirectoryAsync(_tempDir);
+        var video = (await service.GetAllVideosAsync()).Single();
+
+        await service.MarkPlayedAsync(video.Id);
+        await service.MarkPlayedAsync(video.Id);
+
+        var updated = (await service.GetAllVideosAsync()).Single();
+        Assert.Equal(2, updated.PlayCount);
+        Assert.NotNull(updated.LastPlayedAtUtc);
+    }
+
+    [Fact]
+    public async Task PhotoLibrary_Scan_PersistsPhotosAndFolders()
+    {
+        var subDir = Path.Combine(_tempDir, "Vacation");
+        Directory.CreateDirectory(subDir);
+        File.WriteAllBytes(Path.Combine(subDir, "beach.jpg"), new byte[] { 0xFF, 0xD8 });
+        File.WriteAllBytes(Path.Combine(subDir, "sunset.png"), new byte[] { 0x89, 0x50 });
+
+        var service = new PhotoLibraryService(_dbFactory);
+        await service.ScanDirectoryAsync(_tempDir);
+
+        var photos = await service.GetAllPhotosAsync();
+        Assert.Equal(2, photos.Count);
+        Assert.All(photos, p => Assert.Equal(subDir, p.FolderPath));
+
+        var folders = await service.GetFoldersAsync();
+        Assert.Single(folders);
+        Assert.Equal(subDir, folders[0]);
+    }
+
+    [Fact]
+    public async Task PhotoLibrary_RescanSkipsDuplicates()
+    {
+        File.WriteAllBytes(Path.Combine(_tempDir, "a.jpg"), new byte[] { 0xFF, 0xD8 });
+        var service = new PhotoLibraryService(_dbFactory);
+
+        await service.ScanDirectoryAsync(_tempDir);
+        await service.ScanDirectoryAsync(_tempDir);
+
+        var photos = await service.GetAllPhotosAsync();
+        Assert.Single(photos);
+    }
+
+    [Fact]
+    public void VideoPlayback_UnavailableEngine_ShowsGuidanceAndSafeOps()
+    {
+        var vm = new VideoPlaybackViewModel(new UnavailableVideoPlaybackEngine(), new Video { Title = "Test", FilePath = "/x.mp4" });
+
+        vm.Start();
+
+        Assert.False(vm.IsVideoAvailable);
+        Assert.Contains("libvlc", vm.UnavailableText);
+        Assert.Equal(TimeSpan.Zero, vm.Position);
+        Assert.Equal(TimeSpan.Zero, vm.Duration);
+        Assert.Equal(0.0, vm.SeekFraction);
+    }
+
+    [Fact]
+    public async Task PhotoLibraryVM_FolderFilter_AndStats()
+    {
+        var subDir = Path.Combine(_tempDir, "Trip");
+        Directory.CreateDirectory(subDir);
+        File.WriteAllBytes(Path.Combine(subDir, "p1.jpg"), new byte[] { 0xFF, 0xD8 });
+        File.WriteAllBytes(Path.Combine(_tempDir, "p2.jpg"), new byte[] { 0xFF, 0xD8 });
+
+        var service = new PhotoLibraryService(_dbFactory);
+        await service.ScanDirectoryAsync(_tempDir);
+        var vm = new PhotoLibraryViewModel(service);
+        await vm.LoadPhotosAsync();
+
+        Assert.Equal(2, vm.GalleryPhotos.Count); // All Photos default
+
+        vm.SelectedFolder = subDir;
+        Assert.Single(vm.GalleryPhotos);
+        Assert.Equal("Trip", vm.SelectedFolderName);
+        Assert.False(vm.HasNoPhotos);
+
+        vm.SelectedFolder = PhotoLibraryViewModel.AllFoldersEntry;
+        Assert.Equal(2, vm.GalleryPhotos.Count);
+    }
+
+    [Fact]
+    public void PhotoSlideshow_CyclesAndPauses()
+    {
+        var photos = new ObservableCollection<Photo>(
+            new[] { "a.jpg", "b.jpg", "c.jpg" }.Select(f => new Photo { Title = f, FilePath = f }));
+        var vm = new PhotoSlideshowViewModel(photos, 0);
+
+        Assert.Equal("a.jpg", vm.CurrentPhoto!.Title);
+
+        ((RelayCommand)vm.NextCommand).Execute(null);
+        Assert.Equal("b.jpg", vm.CurrentPhoto!.Title);
+
+        ((RelayCommand)vm.BackCommand).Execute(null);
+        Assert.Equal("a.jpg", vm.CurrentPhoto!.Title);
+
+        Assert.True(vm.IsPlaying);
+        ((RelayCommand)vm.PlayPauseCommand).Execute(null);
+        Assert.False(vm.IsPlaying);
+        Assert.Equal("PLAY", vm.PlayPauseIcon);
+    }
+
+    [Fact]
+    public void VideoLibraryVM_EmptyLibrary_ShowsEmptyState()
+    {
+        var vm = new VideoLibraryViewModel(new EmptyVideoLibraryService(), new UnavailableVideoPlaybackEngine());
+
+        Assert.False(vm.HasVideos);
+        Assert.False(vm.IsPlayerOpen);
+    }
+
+    [Fact]
+    public void VideoEngine_InitializesOrDegradesGracefully()
+    {
+        // Exercises the full libVLC native path: either a real VLC installation initializes
+        // (Windows natives from the NuGet package, Linux system libvlc via the resolver),
+        // or the engine degrades to unavailable (headless/CI without VLC).
+        using var engine = new NotZune.Infrastructure.Video.VideoPlaybackEngine();
+
+        engine.LoadAndPlay("/nonexistent/video.mp4");
+
+        if (engine.IsAvailable)
+        {
+            Assert.Equal(TimeSpan.Zero, engine.GetPosition());
+            Assert.NotNull(engine.MediaPlayerHandle);
+        }
+        else
+        {
+            Assert.Null(engine.MediaPlayerHandle);
+        }
+
+        engine.SetVolume(0.5, muted: false);
+        engine.Seek(TimeSpan.FromSeconds(1));
+        engine.Pause();
+        engine.Play();
+        engine.Stop();
+    }
+}