DTS HD Master Audio is losslessly decoded to PCM 5.1/7.1 (and the Pi4B supports 192k/24bit at 5.1/7.1 and isn't limited to 4.0 at 192k as previous models are, I believe) - so it's only Atmos that your Home Theatre is crying for? (Or is stream metadata vital for your use case??)
Hi, I tried to play something in DTS HD MA and i got it decoded to 5.1, but i got 7.1. Dolby Atmos Home Cinema. When i play something in Atmos it is decoded to weird formats like 3.1 Theatre Dimensional.
My settings in audio are 2.0., enable passthrough and enabled formats under it like DTS, AC3 and E-AC3. This works for DTS-HD MA in most of the time. Weird thing is when i set 7.1 in audio setting I got a 5.1.2 sound in output which should be right, but my receiver getting no Atmos (there is a LED which should be lit if Atmos is detected (working in old box S905x).