[FFmpeg-user] Use cropdetect only every xth frame

Carl Eugen Hoyos cehoyos at ag.or.at
Sat Oct 12 08:37:39 CEST 2013


Gerion Entrup <gerion.entrup <at> t-online.de> writes:

> > You can use -skip_frame (see the documentation).
>
> Does not change that much:

Depending on your use-case, this is impossible.
(It of course cannot help for intra-only codecs)

> $ time ffmpeg -skip_frame nokey -i test.mp4 -filter:v 
> select='not(mod(n\,10))',cropdetect 
> -filter:a volumedetect -map 0 -f null 
> /dev/null 2>/dev/null

Complete, uncut console output missing.

Carl Eugen



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