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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	…
doc	avcodec/libopusenc: add option to set inband FEC	2020-09-09 11:40:06 +05:30
ffbuild	…
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	…
libavutil	…
libpostproc	…
libswresample	…
libswscale	…
presets	…
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
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.gitignore	…
.mailmap	…
.travis.yml	…
CONTRIBUTING.md	…
COPYING.GPLv2	…
COPYING.GPLv3	…
COPYING.LGPLv2.1	…
COPYING.LGPLv3	…
CREDITS	…
Changelog	avcodec: add PhotoCD decoder	2020-09-04 16:01:53 +02:00
INSTALL.md	…
LICENSE.md	…
MAINTAINERS	…
Makefile	…
README.md	…
RELEASE	…
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.