On Sat, Jul 04, 2015 at 12:14:51PM +0800, 周晓勇 wrote: > i will offer a download source of Fedora21 OS next Monday. > i will run yum-builddep ffmpeg-xxx.src.rpm for preparing devel environment. > what else do you need to install, because it maybe slow for downloading > other packages abroad. > the new FC21 build with mips64el N64 API and mips64r2(-march=loongson3a) isa, > and enabled ARCH_MIPS64 after ffmpeg configure. > the FC19-O32 was slow, so aborted.
other things hmm ccache, dash, screen > > here i contrast the performance between libav and ffmpeg > i run test on my x86_64 notebook(Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz): > > ffmpeg version 2.5.7-0ubuntu0.15.04.1 Copyright (c) 2000-2015 the FFmpeg > developers > built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13) > avconv version 11.2-6:11.2-1, Copyright (c) 2000-2014 the Libav developers > built on Jan 18 2015 05:12:33 with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu2) > > 1> single thread > --------------------------------------------------------------- > time ffmpeg -threads 1 -i 1920x1080.mp4 -cpuflags 0 -f rawvideo -an -vframes > 4096 -y /dev/null > > frame= 1253 fps= 38 q=0.0 Lsize= 3805988kB time=00:00:52.20 > bitrate=597196.8kbits/s > video:3805988kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB > muxing overhead: 0.000000% > > real 0m33.163s > user 0m33.092s > sys 0m0.056s > > --------------------------------------------------------------- > time avconv -threads 1 -i 1920x1080.mp4 -cpuflags 0 -f rawvideo -an -vframes > 4096 -y /dev/null > > frame= 1253 fps= 40 q=0.0 Lsize= 3805988kB time=52.17 bitrate=597673.8kbits/s > > video:3805988kB audio:0kB other streams:0kB global headers:0kB muxing > overhead: 0.000000% > > real 0m31.154s > user 0m31.036s > sys 0m0.108s > > 2> multi-threads > --------------------------------------------------------------- > time ffmpeg -threads 1 -i 1920x1080.mp4 -cpuflags 0 -f rawvideo -an -vframes > 4096 -y /dev/null > > frame= 1253 fps= 78 q=0.0 Lsize= 3805988kB time=00:00:52.20 > bitrate=597196.8kbits/s > video:3805988kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB > muxing overhead: 0.000000% > > real 0m16.157s > user 0m59.600s > sys 0m0.328s > > --------------------------------------------------------------- > time avconv -threads 1 -i 1920x1080.mp4 -cpuflags 0 -f rawvideo -an -vframes > 4096 -y /dev/null > > frame= 1253 fps= 84 q=0.0 Lsize= 3805988kB time=52.17 bitrate=597673.8kbits/s > > video:3805988kB audio:0kB other streams:0kB global headers:0kB muxing > overhead: 0.000000% > > real 0m15.005s > user 0m55.296s > sys 0m0.240s > > libav is faster than ffmpeg? > the test of other video has same conclusion. there was a bug in -f rawvideo that resulted in a extra copy of the image, ive just fixed it in master, its possible there are more bugs of course [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Democracy is the form of government in which you can choose your dictator
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