(Py)Qt6.6.x-6.7.2: FFmpeg freezes QMediaPlayer when quickly switching between audio files during playback

[Gdaliy]

The behavior is similar on macOS, Windows and Linux.
Switching to native system backends may cause other issues, but without
freezing applications.

Here is the GitHub link to my simple Python test app:
And here are the screen recordings of my tests on macOS,
Windows and Linux, switching from FFmpeg to native system multimedia
backends.

The bug is better reproducible right after the app/script (re)start.
Thanks!