Lynne
c9c3545034
Formats with a _420 or _422 suffix require even dimensions, but frames
contexts of subsampled formats with odd dimensions still got a single
multiplane image, whose chroma planes the drivers rounded down: 320x240
instead of 321x241 at 641x481. FFV1 decoding through the Vulkan hwaccel
corrupted the chroma of such frames, and ffv1_vulkan encoding was not
lossless, on both RADV and ANV.
Use one image per plane for them instead. Hardware decoders are not
affected, as they set the image format and align the frames context
dimensions themselves. Decoding broke when 713e3c4f91 stopped aligning
the frames of decoders without a video profile.
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.