4186a77f26
nvdec will not produce odd width/height output, and while this is basically never an issue with most codecs, due to internal alignment requirements, you can get odd sized jpegs. If an odd-sized jpeg is encountered, nvdec will actually round down internally and produce output that is slightly smaller. This isn't the end of the world, as long as you know the output size doesn't match the original image resolution. However, with an hwaccel, we don't know. The decoder controls the reported output size and the hwaccel cannot change it. I was able to trigger an error in mpv where it tries to copy the output surface as part of rendering and triggers a cuda error because cuda knows the output frame is smaller than expected. To fix this, we can round up the configured width/height passed to nvdec so that the frames are always at least as large as the decoder's reported size, and data can be copied out safely. In this particular jpeg case, you end up with a blank (green) line at the bottom due to nvdec refusing to decode the last line, but the behaviour matches cuviddec, so it's as good as you're going to get.
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 a mean to alter decoded Audio and Video through chain of 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.
- ffserver is a multimedia streaming server for live broadcasts.
- 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.