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The follow cmd output corrupted file before the patch: ffmpeg -f lavfi -i color=blue,trim=duration=0.04 \ -f lavfi -i anullsrc,atrim=duration=2 \ -movflags +empty_moov+hybrid_fragmented \ -frag_duration 1000000 \ -frag_interleave 1 \ output.mp4 1. first_track is the first track with track->entry != 0. As in the command above, video track (track index 0) has a single frame. When flush the second fragment, first_track is 1, the audio track. 2. write_moof = i == first_track, so write_moof is false for i = 0. 3. When mov->frag_interleave != 0, mov->mdat_buf != NULL, because it contains audio data. So avio_write is called before write_moof, that is, the data write before moof, and mov_finish_fragment executed with wrong mdat_start. 4. With normal fmp4 output, the error isn't obvious. With hybrid_fragmented, ffplay output.mp4 shows a lot of error messages. Signed-off-by: Zhao Zhili <zhilizhao@tencent.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 means to alter decoded audio and video through a directed graph of connected 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.