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FFmpeg git repo
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Xu Jun 3c7cad69f2 dnn_backend_native_layer_conv2d.c:Add mutithread function 
Use pthread to multithread dnn_execute_layer_conv2d.
Can be tested with command "./ffmpeg_g -i input.png -vf \
format=yuvj420p,dnn_processing=dnn_backend=native:model= \
espcn.model:input=x:output=y:options=conv2d_threads=23 \
 -y sr_native.jpg -benchmark"

before patch: utime=11.238s stime=0.005s rtime=11.248s
after patch:  utime=20.817s stime=0.047s rtime=1.051s
on my 3900X 12c24t @4.2GHz

About the increase of utime, it's because that CPU HyperThreading
technology makes logical cores twice of physical cores while cpu's
counting performance improves less than double. And utime sums
all cpu's logical cores' runtime. As a result, using threads num
near cpu's logical core's number will double utime, while reduce
rtime less than half for HyperThreading CPUs.

Signed-off-by: Xu Jun <xujunzz@sjtu.edu.cn>
Signed-off-by: Guo, Yejun <yejun.guo@intel.com>
 		2020-09-09 14:24:36 +08:00
compat compat/cuda/ptx2c: remove shell loop; fix BSD sed compat 2020-06-01 22:10:41 -05:00
doc avcodec/libopusenc: add option to set inband FEC 2020-09-09 11:40:06 +05:30
ffbuild ffbuild: Refine MIPS handling 2020-07-23 16:30:02 +02:00
fftools ffplay: fix autoexit doesn't work in the case of pb->error 2020-09-08 19:59:17 +02:00
libavcodec avcodec/libopusenc: add option to set inband FEC 2020-09-09 11:40:06 +05:30
libavdevice avdevice/lavfi: Remove redundant av_packet_unref() 2020-09-06 21:45:41 +02:00
libavfilter dnn_backend_native_layer_conv2d.c:Add mutithread function 2020-09-09 14:24:36 +08:00
libavformat avformat/electronicarts: change non failure return of read_header() to 0 2020-09-08 00:06:53 +02:00
libavresample
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libavutil hwcontext_vaapi: Don't require a render node when deriving from DRM 2020-08-31 21:42:14 +01:00
libpostproc Bump minor versions after branching 4.3 2020-06-08 22:49:04 +02:00
libswresample swresample/rematrix: handle 22.2 as a 9 channel layout 2020-08-18 22:47:35 +03:00
libswscale swscale/x86/output: add missing AVX2 support preprocessor wrappers 2020-08-20 15:14:56 -03:00
presets
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tests dnn_backend_native_layer_conv2d.c:Add mutithread function 2020-09-09 14:24:36 +08:00
tools tools/target_dec_fuzzer: Adjust threshold for WMV3IMAGE 2020-09-07 23:05:25 +02:00
.gitattributes
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.gitignore
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.mailmap mailmap: add entry for myself 2020-07-13 11:24:04 +08:00
.travis.yml
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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 avcodec: add PhotoCD decoder 2020-09-04 16:01:53 +02:00
INSTALL.md
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LICENSE.md
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MAINTAINERS MAINTAINERS: add myself and gpg fingerprint 2020-07-17 21:57:18 +02:00
Makefile Makefile: Delete more created files when running "make distclean". 2020-03-11 11:43:01 +01:00
README.md
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RELEASE RELEASE: We are after the 4.3 branch point, update for that 2020-06-10 00:20:24 +02:00
configure configure: Add additional glslang libraries to make linking work 2020-09-07 13:18:00 -07:00

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.