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The Smacker demuxer buffers audio packets before it outputs them, but it increments the counter of buffered packets prematurely: If allocating the audio buffer fails, an error (most likely AVERROR(ENOMEM)) is returned. If the caller decides to call av_read_frame() again, the next call will take the codepath for returning already buffered audio packets and it will fail (because the buffer that ought to be allocated isn't) without decrementing the number of supposedly buffered audio packets (it doesn't matter whether there would be enough memory available in subsequent calls). Depending on the caller's behaviour this is potentially an infinite loop. This commit fixes this by only incrementing the number of buffered audio packets after having successfully read them and unconditionally reducing said number when outputting one of them. It also changes the semantics of the curstream variable: It is now the number of currently buffered audio packets whereas it used to be the index of the last audio stream to be read. (Index refers to the index in the array of buffers, not to the stream index.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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.