[FFmpeg-user] null video sink

[Carl Eugen Hoyos]

Roger Pack <rogerdpack2 <at> gmail.com> writes:

> I noticed the docs for the "null" video filter say:
> https://ffmpeg.org/ffmpeg-filters.html#nullsink
> Null video sink: do absolutely nothing with the input video. It is
> mainly useful as a template and for use in analysis / debugging tools.
> 
> Could anyone be kind enough to show me how to use this in a filtergraph?
> When I try to, it seems to still output and encode:

ffmpeg is just greedy but the nullsink filter is 
really a nullsink, see also:
ffmpeg -f lavfi -i testsrc -filter_complex vflip,nullsink -t 10 out.avi

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Carl Eugen