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When playing 23.976 or 24 fps media in CinePlay for Apple TV, certain motion such as fast pans may appear to judder or stutter.
This is because tvOS automatically plays back media at either 25 or 30 fps, depending on the rate set in the Apple TV's preferences. This is a limitation within the operating system and is not something we can override. We are hoping this limitation will be lifted in future versions of tvOS.
Go to Settings > Resolution and select one of the 50 Hz options if your TV supports it. While this will still not play back at exactly 24 fps, 25 is much closer than 30.