Here is mentioned, that if you a video URL in the first line it is recognized as a video post.
https://kriesi.at/support/topic/post-video-format/

This is what I did for both posts above, but as you already mentioned one of them (Mopsmodel-Casting in München) is a standard post, which in my opinion should also be displayed in the same way as the other one!

Lukas

Oh, I’m so sorry for bothering! I found the plugin which did this!

Thank you!