When mplayer set, doesn't play m4a

[xubuntu4iran]

But when mpv set, play m4a

[np1]

This behaviour is intentional. See https://github.com/np1/mps-youtube/releases/tag/v0.01.35

The problem is that both mplayer and mpv take a long time to open these m4a streams.

To demonstrate the problem, try:

mpv http://np1.github.io/tricky.m4a

and

mplayer http://np1.github.io/tricky.m4a

I found a workaround to get mpv to open these streams faster (which I have implemented in mpsyt):

mpv --demuxer-lavf-o=fflags=+ignidx http://np1.github.io/tricky.m4a

But I couldn't find an equivalent solution with mplayer, so in mpsyt, mplayer does not attempt to play the m4a streams, instead falling back to ogg, and if no ogg is availabe then falling back to playing the audio from the video stream (and suppressing video output).