[FFmpeg-user] Can I speed up transcoding?
Carl Eugen Hoyos
cehoyos at ag.or.at
Tue Jan 8 11:36:13 CET 2013
Henk D. Schoneveld <belcampo <at> zonnet.nl> writes:
> In your 1st posting, ffmpeg cli output, can be seen
> that the file is encode with threads=1,
(I had missed that, thank you. I am still against trying
to auto-detect a value for threads and this case seems
like a good reason to me, but apparently I am the only
one thinking like that, see a related discussion on
mplayer-users these days.)
> that suggests on EC2 only 1 cpu core is presented to
> ffmpeg. So if more cores are available to you on EC2
> you probably have to specifically have to ask for more
> cores with the threads 2 after c:v.
> Like ffmpeg -y -i some file.ext -c:v libx264 -threads 2 etc.
Note that -threads is both an input and an output option,
it should therefore come before -i iirc.
(Or both before and after?)
And please test values significantly higher than 2.
Please do not top-post here, Carl Eugen
More information about the ffmpeg-user