Dark image

Hello guys,

i just purchased an ATV 4K, and tried VLC and Infuse. VLC works fine, but its dumb, so I’m using Infuse. A few UHD 2160p movie is too dark (especially dark scenes, like cave, room), but it’s working fine with VLC, and its working without problems on Samsung TV’s own media player.
Anybod has a good tip if how can I fix this issue?