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ProRes in Matroska is supposed to not contain the first atom header (containing a size field and the tag "icpf") and therefore the Matroska demuxer has to recreate it; this involves an allocation and copy, of course. Whether the old buffer (containing the data without the atom header) needs to be freed or not depends upon whether it is what was directly read (in which case it is owned by an AVBuffer) or whether it has been allocated when reversing the track's content compression (e.g. zlib compression) that Matroska supports. So there are three pointers involved: The one pointing to the directly read data (owned by the AVBuffer), the one pointing to the currently valid data (which coincides with the former if no content compression needed to be reverted) and the one pointing to the new data with the first atom header. The check for whether to free the second of these is simply whether the first two are different. This works mostly, but there is a complication: Some muxers don't strip the first atom header away and in this case, it is also not reinserted and no new buffer is allocated; instead, the second and the third pointers agree. In this case, one must never free the second buffer. Yet it is currently done if the track is e.g. zlib compressed. This commit fixes this. This is a regression since b8e75a2a. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com> (cherry picked from commit af50f0a515d8096fece9776e2d3034fe990a1373) 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.