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Currently, ff_read_packet() sometimes forwards the return value of AVInputFormat.read_packet() (which should be zero on success, but isn't for all demuxers) and sometimes it overwrites this with zero. Furthermore, it uses two variables, one for the read_packet return value and one for other errors, which is a bit confusing; it is also unnecessary given that the documentation explicitly states that ff_read_packet() never returns positive values. Returning a positive value would lead to leaks with some callers (namely asfrtp_parse_packet and estimate_timings_from_pts). So always return zero in case of success. (This behaviour stems from a time before av_read_packet sanitized the return value of read_packet at all: It was added in commit 626004690c23c981f67228ea325dde3f35193988 and was unnecessary since 88b00723906f68b7563214c30333e48888dddf78.) 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.