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I tried

amixer cset numid=3 1

but I get

amixer: Cannot find the given element from control default

I tested the headphones with

speaker-test -t sine -f 440 -c 2 -s 1

and hear the sound through the headphones and not the tv so I know the hardware works.

But I want the mp4 video I'm playing to redirect the sound to headphones not tv

  • Have a look at pulseaudio. – Ingo Oct 31 at 18:09

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