Those are good questions, thank you. I have 8 SSDs in RAID5 on a LSI 9361 SAS
controller, formatted as NTFS. I got the 3000 number from AJA System Test.
That test was writing a single file, so probably performance would drop when
writing lots of small files. I will benchmark again with small files. I have
no idea about ffmpeg’s write buffer size.
This machine has 28 real CPU cores, so I’m wondering if ffmpeg or lavfi is
limited to one core?
Is there a way to verify whether disk write speed is the bottleneck by using
ffplay? When I run ffplay like this, I don’t see any fps readout, or maybe I
don’t know where to look.
fifteen:~ elliott$ ffplay -f lavfi -i mandelbrot=s=3840x2160 -t 5
ffplay version 3.4.git Copyright (c) 2003-2018 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus
--enable-librsvg --enable-libtheora --enable-libopenjpeg --enable-libmodplug
--enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass
--enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig
--enable-libfreetype --enable-libfribidi --disable-libjack
--disable-libopencore-amrnb --disable-libopencore-amrwb --disable-indev=jack
--enable-opencl --disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox
--enable-sdl2 --mandir=/opt/local/share/man --enable-shared --enable-pthreads
--cc=/usr/bin/clang --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl
--enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree
--enable-libfdk-aac
libavutil 56. 7.101 / 56. 7.101
libavcodec 58. 11.101 / 58. 11.101
libavformat 58. 9.100 / 58. 9.100
libavdevice 58. 1.100 / 58. 1.100
libavfilter 7. 12.100 / 7. 12.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, lavfi, from 'mandelbrot=s=3840x2160':KB sq= 0B f=0/0
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (RGB[0] / 0x424752), rgb0, 3840x2160 [SAR 1:1
DAR 16:9], 25 tbr, 25 tbn, 25 tbc
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