[FFmpeg-user] Error message when combining -vf and -af in command line

[Christian Ebert]

* Kieran O'Leary on Wednesday, March 13, 2019 at 15:27:21 +0000:
> It appears that this is ticket 7712: https://trac.ffmpeg.org/ticket/7712

Ah, right, for some reaseon I didn't catch that when searching the bug
tracker.

> and it was introduced here: https://github.com/FFmpeg/FFmpeg/commit/301cee61fa61c55b1c178ebfbc590872e8b033e6 as an attempt to fix an existing bug: https://trac.ffmpeg.org/ticket/4184

Indeed, I kind of guessed that this is meant to warn about
duplicate -vf or -af.

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