VLC render DVD to Chromecast

I can open and play a DVD in my VLC Media Player. Then I click on render and choose the Chromecast from the menu. It asks my to accept conversion and I choose OK. Then nothing else happens.
When I choose a file from the filesysttem and play it in VLC and the press render to chromecast, the name of the file is visible on the TV-Screen but nothing else happens, no sound no video.

I am using XFCE and VLC Version 3.0.16

Someone an idea, even diagnosis orders, how I can proceed?
I tried to activa debug messages in VLC… looks like no error but I can not copy paste it here because VLC crashes when I start rendering the DVD to chromecast let me unable to copy it.