Topic: Mpv Video Player needs to be updated.
Just check this issue: https://github.com/mpv-player/mpv/issues/8375
Current Mpv player come with the latest SVP4 is version 0.33.0 and was published on 2020-12-06, so the problem of PCM audio playback was not fixed.
Besides, mpv also released v0.33.1 recently which contained security fix: https://github.com/mpv-player/mpv/releases