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It currently does two things: a) Get a prediction for the dc and the dc direction and b) process said prediction. Processing the prediction differs for encoding (getting a diff) and decoding (getting the level via diff+prediction). So having a common function performing b) makes no sense. Even worse, there is a decoding mode where the dc coefficient (diff) is not coded specially and therefore unavailable before entering the block decoding loop, so that one can only perform a). Before this commit, the decoder simply called ff_mpeg4_pred_dc() twice; the results of the b) part of the call before the loop were ignored (but the compiler could not elide them because they involved error messages) and a) was also performed twice. This commit changes this by splitting b) out of ff_mpeg4_pred_dc() and moving this code to decoder and encoder. 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.