> If you add " -f null -" to the above, you can test if the disk
> is the bottleneck (see "fps" in the status line).
> (The command line is supposed to occupy >= 8 cores)
Thanks for the advice everyone. I was wrong about the RAID speeds, it does
seem like disk write is the bottleneck in this case.
> Why do you need 48 bit output? You do realize that the scaler cannot
> "invent" higher precision?
To explain better: My goal was to create an image sequence that I can use as
an input in another program. I don’t actually want a bunch of red frames, that
was just an intermediate test. What I really want is movement, something like
mandelbrot or another fancy filter. Now testing with null output, I get 3.6fps
using mandelbrot. Is there any faster way to do something like this? Assuming
I get much faster storage, I was hoping to get at least 100fps.
ffmpeg.exe -f lavfi -i mandelbrot=s=3840x2160 -t 10 -pix_fmt rgb48le -f null -
ffmpeg version N-90610-g2accdd3871 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib
--enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
--enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
--enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
--enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab
--enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex
--enable-libxvid --enable-libaom --enable-libmfx --enable-amf
--enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc
--enable-nvdec --enable-dxva2 --enable-avisynth
libavutil 56. 13.100 / 56. 13.100
libavcodec 58. 17.100 / 58. 17.100
libavformat 58. 10.100 / 58. 10.100
libavdevice 58. 2.100 / 58. 2.100
libavfilter 7. 14.100 / 7. 14.100
libswscale 5. 0.102 / 5. 0.102
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, lavfi, from 'mandelbrot=s=3840x2160':
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
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf58.10.100
Stream #0:0: Video: wrapped_avframe, rgb48le, 3840x2160 [SAR 1:1 DAR 16:9],
q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.17.100 wrapped_avframe
frame= 54 fps=3.5 q=-0.0 Lsize=N/A time=00:00:02.16 bitrate=N/A speed=0.14x
video:28kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown
Exiting normally, received signal 2.
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