c28e553cbf
Broken in 5ecf5b93dda9d0c69875b80d28929f0d97dd7d06. More precisely, 3994623df2efd2749631c3492184dd8d4ffa9d1b changed the precursor of ff_mpv_reconstruct_mb() to always decode to the first row of macroblocks for B pictures when a draw_horiz_band callback is set and to (they are exported to the caller via said callback and each row overwrites the previously decoded row; this was probably intended as a cache-optimization). This first macroblock row was used as source for the draw_horiz_band callback. This of course means that the ordinary output B-frame was not decoded correctly at all. Therefore the first aforementioned commit removed this special handling of draw_horiz_band; yet it did not remove the special handling for B-frames in ff_draw_horiz_band(), which broke draw_horiz_band for B-frames. This commit fixes this. (Actually, draw_horiz_band was already broken before 5ecf5b93dda9d0c69875b80d28929f0d97dd7d06 when using slice-threading: All slice-threads would write to the first row of macroblocks for B-frames, leading to data races. It seems no one has ever complained about this, just as no one has ever complained about the breakage caused by 5ecf5b93dda9d0c69875b80d28929f0d97dd7d06. Probably no one uses draw_horiz_band.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.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.