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Andreas Rheinhardt 697da64c8e avcodec/x86/h264_qpel: Port pixel8_l2_shift5 from MMXEXT to SSE2 
This abides by the ABI (no missing emms) and yields a tiny
performance improvement here.

Old benchmarks:
avg_h264_qpel_8_mc12_8_c:                              419.9 ( 1.00x)
avg_h264_qpel_8_mc12_8_sse2:                            78.9 ( 5.32x)
avg_h264_qpel_8_mc12_8_ssse3:                           71.7 ( 5.86x)
avg_h264_qpel_8_mc32_8_c:                              429.1 ( 1.00x)
avg_h264_qpel_8_mc32_8_sse2:                            76.9 ( 5.58x)
avg_h264_qpel_8_mc32_8_ssse3:                           73.4 ( 5.84x)
put_h264_qpel_8_mc12_8_c:                              424.0 ( 1.00x)
put_h264_qpel_8_mc12_8_sse2:                            78.6 ( 5.40x)
put_h264_qpel_8_mc12_8_ssse3:                           70.6 ( 6.00x)
put_h264_qpel_8_mc32_8_c:                              425.7 ( 1.00x)
put_h264_qpel_8_mc32_8_sse2:                            75.2 ( 5.66x)
put_h264_qpel_8_mc32_8_ssse3:                           70.4 ( 6.05x)

New benchmarks:
avg_h264_qpel_8_mc12_8_c:                              425.7 ( 1.00x)
avg_h264_qpel_8_mc12_8_sse2:                            77.5 ( 5.49x)
avg_h264_qpel_8_mc12_8_ssse3:                           69.8 ( 6.10x)
avg_h264_qpel_8_mc32_8_c:                              423.7 ( 1.00x)
avg_h264_qpel_8_mc32_8_sse2:                            74.6 ( 5.68x)
avg_h264_qpel_8_mc32_8_ssse3:                           71.9 ( 5.89x)
put_h264_qpel_8_mc12_8_c:                              422.2 ( 1.00x)
put_h264_qpel_8_mc12_8_sse2:                            75.8 ( 5.57x)
put_h264_qpel_8_mc12_8_ssse3:                           67.9 ( 6.22x)
put_h264_qpel_8_mc32_8_c:                              421.8 ( 1.00x)
put_h264_qpel_8_mc32_8_sse2:                            72.6 ( 5.81x)
put_h264_qpel_8_mc32_8_ssse3:                           67.7 ( 6.23x)

Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2025-10-04 07:06:33 +02:00
.forgejo Add myself to CODEOWNERS 2025-09-28 12:35:14 +00:00
compat ALL: move av_unused to conform with standard requirement 2025-09-26 16:15:46 +00:00
doc ogg/vorbis: implement header packet skip in chained ogg bitstreams. 2025-10-01 14:20:55 +00:00
ffbuild configure: properly split C/CXX and CPP flags 2025-09-14 11:45:11 +00:00
fftools fftools/ffmpeg_sched: unchoke upstream nodes on recv-closed filter inputs 2025-09-30 13:16:59 +02:00
libavcodec avcodec/x86/h264_qpel: Port pixel8_l2_shift5 from MMXEXT to SSE2 2025-10-04 07:06:33 +02:00
libavdevice Bump versions for master after release/8.0 2025-08-09 18:03:05 +02:00
libavfilter avfilter/vf_libplacebo: introduce fit_sense option 2025-09-30 15:39:39 +00:00
libavformat avformat/tls_openssl: do not cleanup tls after a successful dtls_start() 2025-10-02 18:41:47 +02:00
libavutil avutil/attributes: prefer clang attributes even in non-gnu builds 2025-09-26 16:15:46 +00:00
libswresample ALL: move av_unused to conform with standard requirement 2025-09-26 16:15:46 +00:00
libswscale swscale/ppc/swscale_ppc_template: Fix av_unused placement 2025-09-26 22:38:13 +02:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests avcodec/h264qpel: Don't build unused 2x2 size funcs for bitdepths > 8 2025-10-04 07:06:33 +02:00
tools forgejo: make aarch64 asm linter part of pre-commit 2025-09-13 20:58:29 +00:00
.gitattributes gitattributes: End merge conflicts in Changelog 2025-03-17 15:26:10 +01:00
.gitignore forgejo/workflows: add initial rudimentary CI 2025-07-22 20:06:20 +02:00
.mailmap mailmap: add entry for myself 2025-08-08 21:51:15 +00:00
Changelog avcodec/libmpeghdec: add MPEG-H 3DA Fraunhofer IIS mpeghdec decoder 2025-09-24 08:25:42 +02:00
configure configure: Remove vc1dsp->qpeldsp dependency 2025-10-04 07:06:32 +02:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1 all: fix whitespace/new-line issues 2025-08-03 13:48:47 +02:00
COPYING.LGPLv3
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
FUNDING.json Add FUNDING.json 2025-06-23 14:48:40 +02:00
INSTALL.md all: fix typos found by codespell 2025-08-03 13:48:47 +02:00
LICENSE.md Remove libpostproc 2025-05-07 15:35:47 +02:00
MAINTAINERS MAINTAINERS: add me for Linux / PowerPC architecture 2025-09-26 13:16:53 +00:00
Makefile build: link with CXX when -lstdc++ on linker commandline 2025-09-14 11:45:11 +00:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE RELEASE: update to 8.0 2025-08-14 08:42:29 -04:00

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.