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7f35c999f6
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Andreas Rheinhardt 7f35c999f6 avcodec/ac3enc: Avoid copying samples 
Only the last 256 samples of each frame are used;
the encoder currently uses a buffer for 1536 + 256 samples
whose first 256 samples contain are the last 256 samples
from the last frame and the next 1536 are the samples
of the current frame.
Yet since 238b2d4155 all the
DSP functions only need 256 contiguous samples and this can
be achieved by only retaining the last 256 samples of each
frame. Doing so saves 6KiB per channel.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-04-18 14:52:26 +02:00
compat
doc lavfi/tonemap_vaapi: Add support for HDR to HDR tone mapping 2024-04-18 14:43:07 +08:00
ffbuild ffbuild/libversion.sh: add shebang 2024-04-09 15:34:53 +02:00
fftools fftools/ffmpeg_filter: implement filtergraph chaining 2024-04-09 10:34:18 +02:00
libavcodec avcodec/ac3enc: Avoid copying samples 2024-04-18 14:52:26 +02:00
libavdevice
libavfilter lavfi/tonemap_vaapi: Add support for HDR to HDR tone mapping 2024-04-18 14:43:07 +08:00
libavformat avformat/ivfenc: remove unused var 2024-04-17 18:31:06 +05:30
libavutil avutil/frame: free the old side data buffer before replacing it 2024-04-11 12:32:13 -03:00
libpostproc
libswresample
libswscale swscale: [LA] Optimize swscale funcs in input.c 2024-04-11 23:53:59 +02:00
presets
tests avutil/frame: add a flag to allow overwritting existing entries 2024-04-11 09:18:19 -03:00
tools
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Changelog Changelog: Add pad_vaapi, drawbox_vaapi entry 2024-04-18 14:43:07 +08:00
configure lavfi: Add drawbox_vaapi filter 2024-04-18 14:43:07 +08:00
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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.