Dolby vision P5 does not work on AM9 Pro

[raylapse 1]

Hi,

The playback device is ugoos am9 pro.
Client is latest emby for android and emby for android tv.
Both of them has following issues:
1. Purple color when playing DV Profile 5 content, even the box do support it.
2. Hi-end audio codecs are down mixed to AC3 but not passthrough, even all my devices support that.

Tried with some third party client app like Moonfin, Yamby, all of them work fine without above two issues.
Please, think about to upgrade the playback engine of emby client! Looking to other popular playback apps in the market, they are widely include at least two playback engine into the app - the native media3 core, and the mpv core.