[FFmpeg-user] Performance Tuning for Raspberry Pi

Bruce Diesel bruce.diesel at gmail.com
Wed Oct 17 22:44:31 EEST 2018

Thanks Carl.   Would the bottleneck by storage I/O or processing.  In other
words, would getting a faster SC Card improve things?  I will test with
lower resolution, maybe 720 instead of full HD.  I have seen mention of
hardware acceleration on Raspberry Pi, is that applicable to this
situation, or is that about video playback?

I will compile the latest ffmpeg and see how that goes.



On Wed, Oct 17, 2018 at 8:29 PM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> 2018-10-17 21:24 GMT+02:00, Bruce Diesel <bruce.diesel at gmail.com>:
> > The command is:
> > ffmpeg -f v4l2 -i /dev/video0 -vf
> >
> drawtext="fontsize=20:fontfile=FreeSerif.ttf:textfile=/dev/shm/Sensors.txt:
> > reload=1:x=(w-text_w)/2:y=(h-text_h)/2" test.mpg
> >
> > The output is:
> > ffmpeg version 3.2.10-1~deb9u1+rpt2 Copyright (c) 2000-2018 the FFmpeg
> This is more than two years old and it is possible that current
> FFmpeg git head contains more optimizations for arm (I don't
> know). If they exist, they should make a measurable difference.
> In any case, don't expect miracles, there is nothing obviously
> wrong with your command line, but you can always compare
> with x264 ultrafast, it may be faster, I never tested.
> Carl Eugen
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