Apple TV 4k: stereo only

Hello, My Apple TV 4k is connected to 5.1 / 7.1 AV receiver. Everythink is fine on any App Game. Sound is OK and AV receiver is 5.1. But VLC convert any video that have 5.1 sound (AAC, AC3...) in stereo. AV receiver shows that sound source is 5.1, but in fact that's stereo sound playing only in Front speakers Left and Right. I tryed both sound settings in Apple TV 4k (TV OS 16.2) but that's still stereo sound at the end :(

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