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Andreas Rheinhardt a162fa0772 avformat/yuv4mpegenc: Simplify writing global and packet headers 
YUV4MPEG writes a string as header for both the file itself as well as
for every frame; these strings contain magic strings and these were up
until now included in the string to write via %s. Yet they are compile
time constants, so one can use the compile-time string concatentation
instead of inserting these strings at runtime.
Furthermore, the global header has been written via snprintf() to
a local buffer first before writing it. This can be simplified by using
avio_printf().

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-09-04 17:34:26 +02:00
compat compat/cuda/ptx2c: remove shell loop; fix BSD sed compat 2020-06-01 22:10:41 -05:00
doc doc/filters: add example for drawtext fontsize expr 2020-09-03 11:09:27 +05:30
ffbuild ffbuild: Refine MIPS handling 2020-07-23 16:30:02 +02:00
fftools fftools/ffmpeg: Fix leak of AVFilterInOut in case of error 2020-08-23 19:57:42 +02:00
libavcodec avcodec: add PhotoCD decoder 2020-09-04 16:01:53 +02:00
libavdevice avdevice/lavfi: Don't set pkt->size to the value it already has 2020-09-01 09:50:05 +02:00
libavfilter avfilter/f_graphmonitor: also show link EOF status in blue 2020-08-31 19:59:35 +02:00
libavformat avformat/yuv4mpegenc: Simplify writing global and packet headers 2020-09-04 17:34:26 +02:00
libavresample
libavutil hwcontext_vaapi: Don't require a render node when deriving from DRM 2020-08-31 21:42:14 +01:00
libpostproc Bump minor versions after branching 4.3 2020-06-08 22:49:04 +02:00
libswresample swresample/rematrix: handle 22.2 as a 9 channel layout 2020-08-18 22:47:35 +03:00
libswscale swscale/x86/output: add missing AVX2 support preprocessor wrappers 2020-08-20 15:14:56 -03:00
presets
tests libavcodec/jpeg2000: fix tag tree reset 2020-08-30 16:18:37 +02:00
tools dnn_backend_native_layer_mathbinary: add floormod support 2020-08-24 09:09:11 +08:00
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.gitignore
.mailmap mailmap: add entry for myself 2020-07-13 11:24:04 +08:00
.travis.yml
Changelog avcodec: add PhotoCD decoder 2020-09-04 16:01:53 +02:00
configure avcodec: add MobiClip video decoder 2020-09-03 18:09:30 +02:00
CONTRIBUTING.md
COPYING.GPLv2
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INSTALL.md
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MAINTAINERS MAINTAINERS: add myself and gpg fingerprint 2020-07-17 21:57:18 +02:00
Makefile Makefile: Delete more created files when running "make distclean". 2020-03-11 11:43:01 +01:00
README.md
RELEASE RELEASE: We are after the 4.3 branch point, update for that 2020-06-10 00:20:24 +02:00

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.
  • 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.