CI: add CI for ubuntu-20.04, add more encoder options

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         # os: [ubuntu-latest, windows-latest, macos-latest]
-        build: [ubuntu-x64, windows-x64, macos-x64, macos-arm64]
+        build: [ubuntu-x64, ubuntu-20.04-x64, windows-x64, macos-x64, macos-arm64]
         config: [Release]
         include:
           - build: ubuntu-x64
@@ -20,6 +20,12 @@ jobs:
             upload-path: /home/runner/.cache/vcpkg/archives
             vcpkg-root: /usr/local/share/vcpkg
             extra-args: ""
+          - build: ubuntu-20.04-x64
+            os: ubuntu-20.04
+            triplet: x64-linux-release
+            upload-path: /home/runner/.cache/vcpkg/archives
+            vcpkg-root: /usr/local/share/vcpkg
+            extra-args: ""
           - build: windows-x64
             os: windows-latest
             triplet: x64-win-llvm-static-release
@@ -52,6 +58,11 @@ jobs:
           sudo apt -y install nasm
         if: matrix.os == 'ubuntu-latest'
 
+      - name: Set up build environment (ubuntu-20.04)
+        run: |
+          sudo apt -y install nasm
+        if: matrix.os == 'ubuntu-20.04'
+
       - name: Patch vcpkg
         run: |
           (cd ${{ matrix.vcpkg-root }} && git fetch origin)

ffmpeg.patch

@@ -2,7 +2,7 @@ diff --git a/ports/ffmpeg/portfile.cmake b/ports/ffmpeg/portfile.cmake
 index 35bac875b..5137c69be 100644
 --- a/ports/ffmpeg/portfile.cmake
 +++ b/ports/ffmpeg/portfile.cmake
-@@ -42,7 +42,20 @@ else()
+@@ -42,7 +42,19 @@ else()
      set(LIB_PATH_VAR "LIBRARY_PATH")
  endif()
  
@@ -13,13 +13,12 @@ index 35bac875b..5137c69be 100644
 +string(APPEND OPTIONS " --disable-everything")
 +string(APPEND OPTIONS " --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=atrac3 --enable-decoder=atrac3p --enable-decoder=atrac9 --enable-decoder=mp3 --enable-decoder=pcm_s16le --enable-decoder=pcm_s8")
 +string(APPEND OPTIONS " --enable-decoder=mov --enable-decoder=h264 --enable-decoder=mpeg4 --enable-decoder=mpeg2video --enable-decoder=mjpeg --enable-decoder=mjpegb")
-+string(APPEND OPTIONS " --enable-encoder=pcm_s16le")
-+string(APPEND OPTIONS " --enable-encoder=ffv1 --enable-encoder=mpeg4 --enable-encoder=mjpeg")
++string(APPEND OPTIONS " --enable-encoder=pcm_s16le --enable-encoder=mp3 --enable-encoder=aac_latm")
++string(APPEND OPTIONS " --enable-encoder=ffv1 --enable-encoder=mpeg4 --enable-encoder=mjpeg --enable-encoder=h264")
 +string(APPEND OPTIONS " --enable-muxer=avi")
 +string(APPEND OPTIONS " --enable-demuxer=h264 --enable-demuxer=m4v --enable-demuxer=mp3 --enable-demuxer=mpegvideo --enable-demuxer=mpegps --enable-demuxer=mjpeg --enable-demuxer=mov --enable-demuxer=avi --enable-demuxer=aac --enable-demuxer=pmp --enable-demuxer=oma --enable-demuxer=pcm_s16le --enable-demuxer=pcm_s8 --enable-demuxer=wav")
 +string(APPEND OPTIONS " --enable-parser=h264 --enable-parser=mpeg4video --enable-parser=mpegaudio --enable-parser=mpegvideo --enable-parser=mjpeg --enable-parser=aac --enable-parser=aac_latm")
 +string(APPEND OPTIONS " --enable-protocol=file")
-+string(APPEND OPTIONS " --enable-bsf=mjpeg2jpeg")
 +string(APPEND OPTIONS " --enable-indev=dshow")
  
  if(VCPKG_TARGET_IS_WINDOWS)