Install mplayer (emerge mplayer, apt install mplayer e.t.c.)

Check available video formats:

mplayer -vo help

Check available audio formats:

mplayer -ao help

Then can try witch video, audio format works:

mplayer -vo fbdev2 -ao pulse video.mkv

Config file located /home/user/.mplayer/config If not, then need to create it.

Config file example:

vo=fbdev2
ao=null
vf=scale=1280:720
framedrop=yes
xy=1280

Then play

mplayer video.mkv

youtube-dl https://www.youtube.com/watch?v=9Auq9mYxFEE -o - | mplayer -