MPV accidently got no sound problem

Question

I was enjoying watching videos through MPV media player without any issue till yesterday.
But Today, I played a video and I found that mpv is NOT able to play audio. I can only see video, but no audio.
I don't know what happened. Given below is the output of mpv welcome.mp4 for your reference.

My system info :

Answer 1

I created a new file mpv.conf in ~/.config/mpv/mpv.conf.

# ===== Audio =====
ao=alsa
audio-device=auto

It is now working perfectly.