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Only the MPEG-1/2, MSMPEG4V1, MPEG-4 and RV.10 decoders use last_dc at all. Of these, RV.10 only uses it for intra frames; it does not need these predictors reset in ff_mpv_reconstruct_mb(). MSMPEG4V1 has h263_pred set, so that last_dc is already not reset in ff_mpv_reconstruct_mb() (instead it is reset at the beginning of every line). MPEG-4 also has h263_pred set (and uses last_dc only for the intra-only studio profile and needs them reset to sligthly different values anyway). So only the MPEG-1/2 decoders need these values reset. So move resetting them there. This avoids resetting them unnecessarily for FLV1, H.261, H.263I, RV.10, RV.20 and H.263(+) (for the latter it depends upon whether h263_aic is in use). 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.