wm4 059db22040 ffmpeg: check for unconnected outputs ...

Fixes e.g.:

ffmpeg -f lavfi -i testsrc -f lavfi -i testsrc -filter_complex "[0:v][1:v]psnr[out]" -f null none

Fixes ticket #6323.

(cherry picked from commit 974ee16d6a)

2017-05-07 19:52:00 +02:00

144 KiB

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