MPV/VLC Video playback is jittery when running under Cinnamon, is not jittery under other desktop environments

Distribution

Mint 22 Cinnamon

Package version

6.2.9

Graphics hardware in use

AMD Radeon RX 6700 XT

Frequency

Always

Bug description

When playing video in MPV, every few seconds there will be a judder, as if frames were being dropped. MPV does not report any dropped or mistimed frames when this happens. Especially noticeable when a shot pans smoothly. This occurs only when running Cinnamon.

Playing back the same video file under the KDE, MATE, lxqt, lxde, and IceWM desktop environments does not exhibit this behaviour.

I have tested both with a custom MPV config and with an unconfigured MPV, the behaviour is the same. I have tested with VLC, and the behaviour occurs on VLC too (Jittery under cinnamon, not under any other DE)

Steps to reproduce

Log into system with Cinnamon
Play a video file with MPV
Log into IceWM/Mate/KDE
Video is not juddering

Expected behavior

Video should not judder

Additional information

Thread on the Mint forums from 2023 on this issue https://forums.linuxmint.com/viewtopic.php?t=404113

Start by reproducing the judder on Linux Mint 22 with Cinnamon using both MPV and VLC, then compare playback under KDE, MATE, LXQt, LXDE, and IceWM as described. The issue provides no files, tests, or Cinnamon entry point; done would require identifying the Cinnamon-specific cause and confirming smooth playback without dropped or mistimed frames.