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AVMediaCodecDeviceContext without surface or native_window is useless, it shouldn't be created at all. Such dummy AVHWDeviceContext is allowed before, and it's used by mpv player. Creating a ANativeWindow automatically breaks such usecases. So disable creating a ANativeWindow by default. It can be enabled via the create_window flag, or by set the AVDictionary of av_hwdevice_ctx_create(). The downside is that ffmpeg -hwaccel mediacodec -i input.mp4 \ -c:a copy -c:v hevc_mediacodec output.mp4 use ByteBuffer mode which isn't as efficient as before. The upside is libavfilter works now, which should be less surprise. To enable create_window on ffmpeg command line, use ffmpeg -hwaccel mediacodec \ -init_hw_device mediacodec=mediacodec,create_window=1 \ -i input.mp4 -c:a copy -c:v hevc_mediacodec output.mp4 Users should know what it is to enable create_window. It should be OK to take sometime to figure out the option. And there are comments inside hwcontext_mediacodec.h to help user figure it out. Signed-off-by: Zhao Zhili <zhilizhao@tencent.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 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.