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Ramiro Polla 2d1358a84d swscale/range_convert: saturate output instead of limiting input 
For bit depths <= 14, the result is saturated to 15 bits.
For bit depths > 14, the result is saturated to 19 bits.

x86_64:
chrRangeFromJpeg8_1920_c:    2126.5   2127.4  (1.00x)
chrRangeFromJpeg16_1920_c:   2331.4   2325.2  (1.00x)
chrRangeToJpeg8_1920_c:      3163.0   3166.9  (1.00x)
chrRangeToJpeg16_1920_c:     3163.7   2152.4  (1.47x)
lumRangeFromJpeg8_1920_c:    1262.2   1263.0  (1.00x)
lumRangeFromJpeg16_1920_c:   1079.5   1080.5  (1.00x)
lumRangeToJpeg8_1920_c:      1860.5   1886.8  (0.99x)
lumRangeToJpeg16_1920_c:     1910.2   1077.0  (1.77x)

aarch64 A55:
chrRangeFromJpeg8_1920_c:   28836.2  28835.2  (1.00x)
chrRangeFromJpeg16_1920_c:  28840.1  28839.8  (1.00x)
chrRangeToJpeg8_1920_c:     44196.2  23074.7  (1.92x)
chrRangeToJpeg16_1920_c:    36527.3  17318.9  (2.11x)
lumRangeFromJpeg8_1920_c:   15388.5  15389.7  (1.00x)
lumRangeFromJpeg16_1920_c:  15389.3  15388.2  (1.00x)
lumRangeToJpeg8_1920_c:     23069.7  19227.8  (1.20x)
lumRangeToJpeg16_1920_c:    19227.8  15387.0  (1.25x)

aarch64 A76:
chrRangeFromJpeg8_1920_c:    6334.7   6324.4  (1.00x)
chrRangeFromJpeg16_1920_c:   6336.0   6339.9  (1.00x)
chrRangeToJpeg8_1920_c:     11474.5   9656.0  (1.19x)
chrRangeToJpeg16_1920_c:     9640.5   6340.4  (1.52x)
lumRangeFromJpeg8_1920_c:    4453.2   4422.0  (1.01x)
lumRangeFromJpeg16_1920_c:   4414.2   4420.9  (1.00x)
lumRangeToJpeg8_1920_c:      6645.0   5949.1  (1.12x)
lumRangeToJpeg16_1920_c:     6005.2   4446.8  (1.35x)

NOTE: all simd optimizations for range_convert have been disabled
      except for x86, which already had the same behaviour.
      they will be re-enabled when they are fixed for each architecture.
2024-12-05 21:10:29 +01:00
compat compat: Fix the fallback definition of stdc_trailing_zeros 2024-09-24 14:00:27 +03:00
doc avutil/csp: add EOTF function definitions 2024-12-05 12:27:32 +01:00
ffbuild configure: Add wasm as a fake arch 2024-12-04 16:43:06 +08:00
fftools fftools/ffmpeg_sched: signal the main thread when a task fails 2024-11-25 05:26:49 +01:00
libavcodec avcodec/hevc: Add wasm simd128 idct 2024-12-04 16:43:07 +08:00
libavdevice avdevice/dshow: fix unused variable warning 2024-10-17 13:04:17 +02:00
libavfilter avfilter/asrc_sine: increase frequency accuracy 2024-11-29 21:16:22 +01:00
libavformat avformat/mov: add support for pssh box 2024-12-05 14:22:16 -03:00
libavutil avutil/tests/color_utils: add tests for av_csp_itu_eotf 2024-12-05 12:27:33 +01:00
libpostproc */version.h: bump after release/7.1 branch 2024-09-24 17:10:35 +02:00
libswresample arm: Consistently use proper interworking function returns 2024-10-09 15:52:51 +03:00
libswscale swscale/range_convert: saturate output instead of limiting input 2024-12-05 21:10:29 +01:00
presets
tests checkasm/sw_range_convert: test negative input values 2024-12-05 21:10:29 +01:00
tools tools/general_assembly: exclude Derek from GA emails 2024-11-28 15:51:37 +01:00
.gitattributes lavf/assenc: normalize line endings to \n 2024-02-11 17:01:07 -08:00
.gitignore .gitignore: add exclusions for shader .c files 2024-11-18 07:54:21 +01:00
.mailmap mailmap: add entry for myself 2024-07-15 01:59:37 +02:00
Changelog lavc: deprecate the omx encoders 2024-11-09 02:46:17 +01:00
configure configure: Add wasm as a fake arch 2024-12-04 16:43:06 +08:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md INSTALL: explain the circular dependency issue and solution 2024-11-03 19:35:23 +01:00
LICENSE.md
MAINTAINERS MAINTAINERS: Lauri is still available but is really low on time nowadays 2024-11-28 23:19:00 +01:00
Makefile configure: Add wasm as a fake arch 2024-12-04 16:43:06 +08:00
README.md
RELEASE RELEASE: update release number after release/7.1 branch 2024-10-09 01:55:50 +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 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.