mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-02-04 06:08:26 +02:00
010e345afe
by using buffers on the stack instead. The fact that the effective lifetime of most of the allocated buffers doesn't overlap enables one to limit the stack space used to a fairly modest size (about 1.5 KiB). That all the buffers used in HuffContexts have always the same number of elements (namely 256) makes it possible to include the buffers directly in the HuffContext. Doing so also makes the length field redundant; it has therefore been removed. This is beneficial for performance: For GCC 9 the time for one call to smka_decode_frame() for the sample in ticket #2425 went down from 1794494 to 1709043 decicyles; for Clang 9 it decreased from 1449420 to 1355273 decicycles. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.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.