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19ce064239
SMVJPEG stores frames as slices of a big JPEG image. The decoder is implemented as a wrapper that instantiates a full internal MJPEG decoder, then forwards the decoded frames with offset data pointers. This is unnecessarily complex and fragile, not supporting useful decoder capabilities like direct rendering. Re-implement the decoder inside the MJPEG decoder, which is accomplished by returning each decoded frame multiple times, setting cropping information appropriately on each instance. One peculiar aspect of the previous design is that since - the smvjpeg decoder returns one frame per input packet - there are multiple frames in each packets (the aformentioned slices) the demuxer needs to return each packet multiple times. This is now also eliminated - the demuxer now returns each packet exactly once, with the duration set to the number of frames it decodes to. This also removes one of the last remaining internal uses of the old video decoding API.
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analysis tool to inspect multimedia content.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to the ffmpeg-devel mailing list using
git format-patch or git send-email. Github pull requests should be
avoided because they are not part of our review process and will be ignored.