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avcodec_open2() allows to provide options via an AVDictionary; but it is also allowed to set options by simply setting the value of the AVCodecContext or via the AVOptions API if the codec has a private class. Any options provided via an AVDictionary have already been applied before ff_frame_thread_init(), so in order to copy all the options from the main AVCodecContext and its private context, it is enough to av_opt_copy() these options. The current code does this, but it does more: It also copies the user-provided AVDictionary and uses it for the initialization of each of the worker-AVCodecContexts. This is completely unnecessary, because said options have already been copied from the main context. Furthermore, these options were also examined to decide if frame threading should be used for huffman encoding in case this would incur nondeterminism. This is wrong, because options not set via an AVDictionary are ignored. Instead inspect the values stored in the contexts directly. (In order to maintain the current behaviour, the default value of the "non_deterministic" option has been changed to false, because the absence of an entry with said key in the AVDictionary had the consequence of disallowing nondeterminism.) Finally, the AVDictionary has been removed from the signature of ff_frame_thread_encoder_init(). 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 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.
- 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.