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Derek Buitenhuis a2d3511154 lavc/ffv1: Properly check that the 4th and 5th quant tables are zeroes Currently, the decoder checks the 128th value of the 4th quant table during while deriving the context on each sample, in order to speed itself up. This is due to relying on the behavior of FFmpeg's FFV1 encoder, in which if that value is zero, the entire 4th and 5th quant tables are assumed to be entirely zero. This does not match the FFV1 spec, which has no such restriction, and after some discussion, it was decided to fix FFmpeg to abide by the spec, rather than change the spec. We will now check whether the 4th and 5th quant tables are zero properly, by checking the 128th valye of both tables (which means they are zero due to the way they're coded in the bitstream). For further context, the FFV1 issue in question is located at: https://github.com/FFmpeg/FFV1/issues/169 Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>		2020-01-06 00:06:03 +00:00
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README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

libavcodec provides implementation of a wider range of codecs.
libavformat implements streaming protocols, container formats and basic I/O access.
libavutil includes hashers, decompressors and miscellaneous utility functions.
libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
libavdevice provides an abstraction to access capture and playback devices.
libswresample implements audio mixing and resampling routines.
libswscale implements 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, ismindex and qt-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.