63d875772d
AVHWAccel.end_frame can run on a worker thread. The assumption of the frame threading code is that the worker thread will change the AVFrame image data, not the AVFrame fields. So the AVFrame fields are not synced back to the main thread. But this breaks videotoolbox due to its special requirements (everything else is fine). It actually wants to update AVFrame fields. The actual videotoolbox frame is now stored in the dummy AVBufferRef, so it mimics what happens in non-videotoolbox cases. (Changing the AVBufferRef contents is a bit like changing the image data.) The post_process callback copies that reference to the proper AVFrame field. Based on a patch by wm4. Signed-off-by: Aman Gupta <aman@tmm1.net>
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.