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 -