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How to force Mencoder to downmix?

Posted: Mon Nov 28, 2016 5:56 pm
by Robn
What options do I need to set in mencoder to downmix any audio with more than 6 channels?

I tried adding the following to codec specific parameters window:
(channels == 7 || channels == 8) :: -af channels=2

I also tried adding -af channels=2 to custom options. But it does nothing when playing back a video. I cannot seem to force a downmix in audio at all.