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Nicolas George 0bd1be65e8 lavd/xcbgrab: do not try to create refcounted packets. 
The framework will allocate a buffer and copy the data to it,
that takes time. But it avoids constently creating and
destroyng the shared memory segment, and that saves more time.

On my setup,
from ~200 to ~300 FPS at full screen (1920×1200),
from ~1400 to ~3300 at smaller size (640×480),
similar to legacy x11grab and confirmed by others.

Plus, shared memory segments are a scarce resource,
allocating potentially many is a bad idea.

Note: if the application were to drop all references to the
buffer before the next call to av_read_frame(), then passing
the shared memory segment as a refcounted buffer would be
even more efficient, but it is hard to guarantee, and it does
not happen with the ffmpeg command-line tool. Using a small
number of preallocated buffers and resorting to a copy when
the pool is exhausted would be a solution to get the better
of both worlds.
2016-11-03 21:23:55 +01:00
compat compat/cuda: convert to unix line endings 2016-09-23 11:43:00 +02:00
doc avformat/mpegtsenc: Add option to mark stream begin as discontinuous 2016-11-02 16:34:01 +01:00
libavcodec hevc: Move hevc_decode_extradata before frame decoding 2016-11-03 16:28:04 +01:00
libavdevice lavd/xcbgrab: do not try to create refcounted packets. 2016-11-03 21:23:55 +01:00
libavfilter vf_colorspace: Add support for film primaries 2016-11-01 17:47:25 -04:00
libavformat lavf/mov.c: Use the first sidx for tracks without sidx. 2016-11-03 19:03:22 +01:00
libavresample Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libavutil Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libpostproc Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libswresample Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
libswscale Bump minor versions after 3.2 branchpoint to seperate release 2016-10-26 20:52:42 +02:00
presets
tests tests/fate/avformat: add segment.c tests 2016-11-02 01:16:26 -05:00
tools tools: fix grammar error 2016-10-09 20:09:00 +02:00
.gitattributes
.gitignore Merge commit '6641819feedb086ebba3d2be89b8d33980f367e1' 2016-06-26 15:43:05 +02:00
.travis.yml
arch.mak
Changelog crystalhd: Switch to new decode API and remove the insanity 2016-11-02 13:47:30 -07:00
cmdutils_common_opts.h
cmdutils_opencl.c
cmdutils.c cmdutils: fix typos 2016-10-09 20:09:00 +02:00
cmdutils.h cmdutils: fix typos 2016-10-09 20:09:00 +02:00
common.mak Merge commit 'c5fd4b50610f62cbb3baa4f4108139363128dea1' 2016-06-27 19:39:46 +02:00
configure configure: add '-uninstalled' to uninstalled .pc files 2016-10-30 20:50:11 -07:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
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CREDITS
ffmpeg_cuvid.c doc: fix spelling errors 2016-10-21 23:58:47 +02:00
ffmpeg_dxva2.c Merge commit '18c506e9e6e8df8b1d496d093077b8240ea68c28' 2016-06-26 15:34:01 +02:00
ffmpeg_filter.c ffmpeg: fix width/height overrides for sub2video processing 2016-11-03 16:20:59 +01:00
ffmpeg_opt.c Merge commit '722ec3eb35bc152ce91d0a4502eca0df1c0086d0' 2016-11-03 14:53:58 +01:00
ffmpeg_qsv.c ffmpeg/qsv: fix QSV-accelerated transcode performance drop issue. 2016-08-16 17:09:33 +02:00
ffmpeg_vaapi.c ffmpeg_vaapi: fix choice of decoder_format 2016-09-29 01:23:52 +02:00
ffmpeg_vdpau.c Merge commit 'f72db3f2f3a8c83a4f5dede8fa03434b2bf676c6' 2016-06-26 15:29:39 +02:00
ffmpeg_videotoolbox.c
ffmpeg.c Merge commit '722ec3eb35bc152ce91d0a4502eca0df1c0086d0' 2016-11-03 14:53:58 +01:00
ffmpeg.h Merge commit '722ec3eb35bc152ce91d0a4502eca0df1c0086d0' 2016-11-03 14:53:58 +01:00
ffplay.c Merge commit 'beb62dac629603eb074a44c44389c230b5caac7c' 2016-10-07 13:16:36 +02:00
ffprobe.c lavf: add AV_DISPOSITION_TIMED_THUMBNAILS 2016-10-24 05:47:05 -05:00
ffserver_config.c
ffserver_config.h
ffserver.c cmdutils: remove the current working directory from the DLL search path on win32 2016-08-08 18:36:55 +02:00
INSTALL.md
library.mak Merge commit 'c5fd4b50610f62cbb3baa4f4108139363128dea1' 2016-06-27 19:39:46 +02:00
LICENSE.md lavc: remove libfaac wrapper 2016-10-01 19:58:04 +01:00
MAINTAINERS MAINTAINERS: add myself for audiotoolbox 2016-10-24 01:47:52 -05:00
Makefile Merge commit '6641819feedb086ebba3d2be89b8d33980f367e1' 2016-06-26 15:43:05 +02:00
README.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
RELEASE RELEASE: Update for past 3.2 branch 2016-10-26 20:52:43 +02:00
version.sh version.sh: Fix spurious rebuilds. 2016-03-10 09:53:10 +01:00

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements 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, ismindex and qt-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.