Stutter Video and Silent Audio

[Rynunr]

[DEVICE : XIAOMI MI MIX 2S]

A few days ago, I was doing a Custom ROM.

I installed a ROM called Extended UI which said it's based on Pixel Experience.
Everything seemed OK at first, but when I tried to play some YouTube videos, the problem came.
Videos were stuttering so bad, a gap between each second took nearly 2 seconds. Also, there was no sound came out from my speaker.
Therefore, I did a full wipe and reinstalled another ROM, nevertheless the problem still there.

Then I discovered something, that when I was trying to set an alarm, the sound was there, as well as the notification sound.

Today, when I tried to download a video from YouTube, played it via VLC Player, the video didn't stutter, yet the sound still not came out.

Is there any solutions for this?

 

[Rukbat]

Contact the ROM developer. There's a bug in the ROM. (Are you certain that the ROM is for the XIAOMI MI MIX 2S? You can't mix ROMs and phones.)