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I can't come up with a nice way to handle this. It's hard to keep the lock-stepped input/output in this case. You can't predict whether the MMAL decoder will output a picture (because it's asynchronous), so you have to assume in general that any packet could produce 0 or 1 frames. You can't continue to write input packets to the decoder, because then you might get too many output frames, which you can't get rid of because the lavc decoding API does not allow the decoder to return an output frame without consuming an input frame (except when flushing). The ideal fix is a M:N decoding API (preferably asynchronous), which would make this code potentially much cleaner. For now, this hack will do.
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.
- ffserver is a multimedia streaming server for live broadcasts.
- 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.