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According to Dave Airlie: > <airlied> but I think ignoring it should be fine, I can't see any > other way to get the imaeg extents correct for other usage > <Lynne> what width/height should be used for the images? > the final presentable dimensions, or the coded dimensions? > <airlied> if you don't want noise I think the presentable dims > <airlied> the driver should round up the allocations internally, > but if you are going to sample from the images then w/h have to be > the bounds of the image you want > <airlied> since otherwise there's no way to stop the sampler from > going outside the edges Apparently, the alignment values are informative, rather than mandatory, but the spec's wording makes it sound as if they're mandatory.
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.