Video decoding regression on Pinephone

Describe your issue

Some weeks ago pinephone devices was able to play smoothly videos from say youtube.com. It looks like the video decoding had a regression recently.

What's the expected behaviour?

mpving video from youtube, with youtube-dl as backend, was working very nicely. 720p videos was very smooth and we started to see sluttering on HD videos.

What's the current behaviour?

The video is very sluttering. Mpv is complaining :

Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).

How to reproduce your issue?

On sxmo sway version, open a terminal and play a video :

$ cat .config/mpv/mpv.conf 
[low]
ytdl-format=bestvideo[height>480][height<=720][fps>=25][fps<=30]+bestaudio/bestvideo[height<=480]+bestaudio/bestvideo[height<=720]+bestaudio/best[height<=720]
$ mpv --fs --profile=low https://yewtu.be/watch?v=AwKHmOSW_cg

What device are you using?

Pinephone

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v22.06

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Environments

• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• Other: Please fill out