Direkt play audio with android plex app via chromecast

Server Version#: 1.40.5.8897
Player Version#: 10.19.4.1255

Hello everyone,
I use Plex app on Android 13 to stream music (mp3/flac) via Chromecast to LG soundbar. I am running Plex Media Server on raspberry pi. The music playback starts to stutter massively after about 10sec. I see that the Plex Media Server switches at this moment from initially direct play to transcoding audio to OPUS format.

Another app Hi-Fi Cast can play the same music files from the Plex server via Chromecast without any problems. I can set direct audio transmission in this app. it works then fine in Hi-Fi Cast and chromecast with the soundbar.

So the transcoding to OPUS on plex media server may cause the problem.

How can I solve this stuttering problem under Plex? Is it possible, for example, to transmit the audio directly via Chromecast without transcoding in the Plex app under Android (I found no such setting )? Any other solution?

Thank you!

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