Lip Sync with English videos on ATV

Hello - I use long term ATV as player for plex videos. The plex server is on a uGreen NAS via docker and runs fine so far. The macOS is running in German. The ATV is connected to an Optoma beamer with HDMI cable. Video on HDMI 3 port, frame rate and bit rate set to automatic.

My problem occurs if I run movies in English. The audio is out of sync a little bit - video is a little slower than audio. In German language all is OK. If I turn of automatic frame rate change, the movie runs in 60 Hz no matter what the genuine rate is - usually 24 Hz. Then the lip sync is OK, but often cooler is not optimal. On apples ATV+ player, all is OK.

Can anyone help me with the settings on the player?

Thanks - and have a nice Sunday.

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