Jellyfin Android Client Black Screen

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Your client likely doesn't support DTS-HD MA and you've disabled transcoding (from what you've said). It's likely trying to play without being able to do so. The issue doesn't lie with the media player, it's the media.

You can use an external player that works, you can enable audio-only transcoding, or you can re-encode the audio yourself to something like DDP which seems to be compatible.