360 videocapture with media framework in scene

Hi everyone,

currently I am trying to setup a 360 video rendering of a scene, where I have some videos displayed as textures in it.
I am using the Stereo panorama plugin but this disabled my mediaplayers. Now I have upgraded to 4.18 where I can use the Img Media Source because it was said, that this would run sincronized.

But when i check my Outputs then the objects with my media texture have artifacts. It seems that the videos went on playing while the capture was rendering one frame. So in one part I can see the beginning of the video and on other parts the mid or the end of it.

Is there a way to prevent the media framework to update until the capture of the frame is finished?
Or is there an other way to get a 360 video out of Unreal?
The only other idea was to rendere six normal cameras that are attatched to all faces of a cube and stitch those videos in an external programm.

Greetings

Evil_Fischi