947c2aa456
This commit replaces the 1 microsecond delay by 500 microsecond for the case when the MFX library does return MFX_WRN_DEVICE_BUSY status. In general this warning never appears for simple encoding or transcoding session because the GPU is so fast so it almost always is not busy and any delay value just does not executes. But for heavy transcoding tasks for example, when several QSV sessions are running simultaneously then using a 1-microsecond delay may result in 1000 iterations per each frame. So here possible a paradoxical case when GPU loading also loads CPU by dummy tasks. Official MFX/QSV samples by Intel are using 1 millisecond (i.e. 1000 microseconds) everywhere where MFX_WRN_DEVICE_BUSY does appear. So 500us is a much more optimal value than 1us. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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.