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I'm trying to debug some FFMPEG filters and can't get graph2dot to work. Using the simplest example from the documentation:

echo "nullsrc,scale=640:360,nullsink" > vf
graph2dot  -i vf -o graph.tmp

I get:

[AVFilterGraph @ 000001578c483b40] No such filter: 'nullsrc'
Failed to parse the graph description

Using windows, but it should not matter.

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