Videos not working in presentation mode on Fedora

Hi, I have a presentation with videos in H.264 embedded. I can play the videos when I am in edit mode by clicking on them and then clicking the play button. However, in presentation mode (fullscreen and windowed) the video hangs at the first slide and one cpu core goes up to 100%.

Any idea what that might be?

Happens in libreoffice-impress 6.1.2.1,