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Rémi Denis-Courmont c654e37254 lavc/h264dsp: R-V V high-depth h264_idct8_add 
Unlike the 8-bit version, we need two iterations to process this within
128-bit vectors. This adds some extra complexity for pointer arithmetic
and counting down which is unnecessary in the 8-bit variant.

Accordingly the gain relative to C are just slight better than half as
good with 128-bit vectors as with 256-bit ones.

T-Head C908 (2 iterations):
h264_idct8_add_9bpp_c:       17.5
h264_idct8_add_9bpp_rvv_i32: 10.0
h264_idct8_add_10bpp_c:      17.5
h264_idct8_add_10bpp_rvv_i32: 9.7
h264_idct8_add_12bpp_c:      17.7
h264_idct8_add_12bpp_rvv_i32: 9.7
h264_idct8_add_14bpp_c:      17.7
h264_idct8_add_14bpp_rvv_i32: 9.7

SpacemiT X60 (single iteration):
h264_idct8_add_9bpp_c:       15.2
h264_idct8_add_9bpp_rvv_i32:  5.0
h264_idct8_add_10bpp_c:      15.2
h264_idct8_add_10bpp_rvv_i32: 5.0
h264_idct8_add_12bpp_c:      14.7
h264_idct8_add_12bpp_rvv_i32: 5.0
h264_idct8_add_14bpp_c:      14.7
h264_idct8_add_14bpp_rvv_i32: 4.7
 		2024-07-14 21:06:50 +03:00
compat
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doc doc/examples/mux: remove nop 2024-07-12 16:40:51 +02:00
ffbuild
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fftools fftools/ffmpeg_mux_init: default to input timebase for streamcopy 2024-07-09 11:14:08 +02:00
libavcodec lavc/h264dsp: R-V V high-depth h264_idct8_add 2024-07-14 21:06:50 +03:00
libavdevice libavdevice: Improve example in deprecation message for opengl and sdl 2024-07-14 13:31:03 +02:00
libavfilter avfilter/vf_tiltandshift: Free dst on error 2024-07-12 21:58:50 +02:00
libavformat avformat/dvdvideodec: Fix incorrect padding cell trim logic 2024-07-13 17:17:36 +02:00
libavutil vulkan: rename read_only to singular 2024-07-14 18:33:56 +02:00
libpostproc
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libswresample swresample/swresample: Rectify invalid function in the documentation 2024-07-02 21:57:17 +02:00
libswscale swscale/utils: fix leak on threaded ctx init failure 2024-07-14 13:48:59 +02:00
presets
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tests avformat/movenc: support writing cropping values 2024-07-11 10:22:47 -03:00
tools tools/target_enc_fuzzer: A64MULTI5 encoder is very slow, check and adjust threshold 2024-07-12 22:44:19 +02:00
.gitattributes
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.gitignore
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.mailmap
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CONTRIBUTING.md
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COPYING.GPLv2
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COPYING.GPLv3
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COPYING.LGPLv2.1
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COPYING.LGPLv3
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CREDITS
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Changelog Changelog: mention cropping support in Matroska and MP4 2024-07-11 21:35:40 -03:00
INSTALL.md
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LICENSE.md
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MAINTAINERS MAINTAINERS: add myself as d3d12va_encode maintainer 2024-07-10 18:10:08 +02:00
Makefile
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README.md
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RELEASE
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configure x86/intreadwrite: add missing casts to pointer arguments 2024-07-11 18:24:26 -03:00

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.