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Andreas Rheinhardt 60ada0f5fa avcodec/elbg: Keep buffers to avoid allocations and frees 
Up until now, each call to avpriv_elbg_do() would result
in at least six allocations. And this function is called a lot:
A typical FATE run results in 52213653 calls to av_malloc; of these,
34974671 originate from av_malloc_array and from these 34783679
originate from avpriv_elbg_do; the msvideo1 encoder tests are behind
most of these.

This commit changes this by keeping the buffers and only reallocating
them when needed. E.g. for the encoding part of fate-vsynth1-msvideo1
total heap usage went down from 11,407,939 allocs and frees with
468,106,207 bytes allocated to 3,149 allocs and frees with 13,181,847
bytes allocated. The time for one encode2-call went down by 69%.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-09-20 05:40:51 +02:00
compat Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
doc avutil/mem: Deprecate av_mallocz_array() 2021-09-20 01:04:09 +02:00
ffbuild avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
fftools fftools/ffmpeg_opt: Add missing AV_OPT_SEARCH_FAKE_OBJ 2021-09-20 02:19:56 +02:00
libavcodec avcodec/elbg: Keep buffers to avoid allocations and frees 2021-09-20 05:40:51 +02:00
libavdevice libavdevice/avfoundation.m: fix potential unreleased lock issue 2021-09-17 15:31:40 +02:00
libavfilter avcodec/elbg: Add persistent ELBGContext 2021-09-20 04:38:45 +02:00
libavformat Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
libavutil avutil/mem: Deprecate av_mallocz_array() 2021-09-20 01:04:09 +02:00
libpostproc postproc/postprocess: Remove legacy cruft 2021-07-29 22:02:06 +02:00
libswresample Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
libswscale Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
presets
tests Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
tools Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
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.gitignore avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
.mailmap mailmap: add entry for myself 2021-03-09 02:09:55 +00:00
.travis.yml
Changelog avfilter: add audio psychoacoustic clipper 2021-09-11 16:19:40 +02:00
configure avfilter/frei0r: use win32dlfcn wrapper 2021-09-15 12:37:02 +02:00
CONTRIBUTING.md
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MAINTAINERS avformat: add Argonaut Games CVG demuxer 2021-05-12 20:25:50 +10:00
Makefile FATE: add a test for sliced scaling 2021-08-08 19:26:05 +02:00
README.md
RELEASE Bump Versions before release/4.4 branch 2021-03-20 01:01:12 +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.
  • 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.