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Ganesh Ajjanagadde 20a30077c3 avutil/mathematics: correct documentation for av_gcd 
av_gcd is now always defined regardless of input. This documents this
change in the "documented API". Two benefits (closely related):
1. The function is robust, and there is no need to worry about INT64_MIN, etc.

2. Clients of av_gcd, like av_reduce, can now be made fully correct. Currently,
av_reduce can trigger undefined behavior if e.g num is INT64_MIN due to
integer overflow in the FFABS. Furthermore, this undefined behavior is
completely undocumented, and could be a fuzzer's paradise. The FFABS was needed in the past as
av_gcd was undefined for negative inputs. In order to make av_reduce
robust, it is essential to guarantee that av_gcd works for all int64_t.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-10-30 13:42:04 -04:00
compat
doc doc/general.texi: fix SDX2 description 2015-10-29 21:29:47 +01:00
libavcodec lavc/proresdec2: Fix slice_count for very high resolutions. 2015-10-30 01:32:39 +01:00
libavdevice Replace remaining occurances of av_free_packet with av_packet_unref 2015-10-27 14:35:30 +01:00
libavfilter vf_lut: Add support for RGB48 and RGBA64. 2015-10-30 03:55:12 +01:00
libavformat avformat/3dostr: Remove redundant ; 2015-10-30 03:02:41 +01:00
libavresample
libavutil avutil/mathematics: correct documentation for av_gcd 2015-10-30 13:42:04 -04:00
libpostproc
libswresample swr: do not reject channel layouts that use channel 63 2015-10-28 19:25:49 +01:00
libswscale swscale: rename sws_rgb2rgb_init to ff_sws_rgb2rgb_init 2015-10-29 23:49:46 +01:00
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ffmpeg_dxva2.c
ffmpeg_filter.c ffmpeg_filter: check encoder before using it to set frame size. 2015-10-30 10:55:10 +01:00
ffmpeg_opt.c
ffmpeg_qsv.c
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ffmpeg.c ffmpeg: use log10 instead of log()/log(10) 2015-10-29 19:05:29 -04:00
ffmpeg.h
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ffprobe.c ffprobe: Remove abort() 2015-10-28 10:12:15 +01:00
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ffserver.c Replace remaining occurances of av_free_packet with av_packet_unref 2015-10-27 14:35:30 +01:00
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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. Few developers follow pull requests so they will likely be ignored.