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Andreas Rheinhardt bc7de8b63c avcodec/mpeg12dec: Don't initialize IDCT more than once 
Before 998c9f15d1, the IDCTDSPContext
has only been initialized in ff_mpv_common_init() which is deferred
until immediately before decoding a picture; to nevertheless parse
the quant matrices in sequence headers or quant matrix extensions,
a dummy (identity) permutation has been stored in the codec's init
function; after ff_mpv_common_init() which could change the permutation
the matrices were repermutated.

Yet since said commit, the IDCTDSPContext is initialized during init
and does not change afterwards (unless the user forces different CPU
flags), so there is no need to reinitialize it; the repermutation code
can be removed as well.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-10-05 22:05:21 +02:00
compat
doc doc/developer: deduplicate commit message rules 2023-10-03 15:58:22 +02:00
ffbuild
fftools fftools/ffmpeg: move derivation of frame duration from filter framerate 2023-10-03 16:57:02 +02:00
libavcodec avcodec/mpeg12dec: Don't initialize IDCT more than once 2023-10-05 22:05:21 +02:00
libavdevice avformat/avformat: Deprecate AVFMT_ALLOW_FLUSH 2023-10-03 01:45:46 +02:00
libavfilter lavfi/yadif: update output frame durations 2023-10-03 16:57:02 +02:00
libavformat avformat/avs: Check if return code is representable 2023-10-03 20:09:27 +02:00
libavutil lavu/float_dsp: avoid reg-stride in R-V V fmul_window 2023-10-03 22:48:10 +03:00
libpostproc
libswresample
libswscale swscale/rgb2rgb: R-V V deinterleaveBytes 2023-10-03 22:53:20 +03:00
presets
tests fftools/ffmpeg_enc: do not round frame durations prematurely 2023-10-03 16:57:02 +02:00
tools tools/target_dec_fuzzer: Adjust wmapro threshold 2023-10-03 20:09:27 +02:00
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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 means to alter decoded audio and video through a directed graph of connected 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.