Compositing (Composure) , problems with MediaPlayer, Chromakey

Hi,
I come to you because I’ve spent one week for a simple thing and i’m still at point 0 (very demoralizing to speak frankly to you), so please :pray:

I’m beginner with UE (not noob at all with softs), Osx M2, tested on UE 4.27 as 5.1, tried with Video as images sequences, everything in fact.:smiling_face_with_tear:
Secund, a pic might save some time, big size here: 01 hosted at ImgBB — ImgBB

Well, i do a Composition with Composure everything properly as mentioned steps by step on UE documentations, youtube, etc, still the two problems…

By clicking on the main parent Comp_, sometimes the results appears proprely in the viewport, sometimes not.
And sometimes the results are good by selecting each Comp_CG as Comp_Media (even with Chroma) and none those three with the parent Comp (image “Wtf”)

By trying another way simply with plane without Composure (Basic Keying Realtime Video onto Geometry in Unreal Engine for Virtual Production - YouTube), when clicking on Play the simulation, plane don’t appear in the simulation.
When I go back to the editor, MediaPlayer has no more it link to the MediaSource.

Common point 1 & 2 :

  • Nothing in simulation, no more Media
  • Simulation plants the link in the MediaPlayer to ut source everytimes.

It may be a noob problem (or stupidly because of UE and M2/Metal basic problems ?), but by doing exactly as UE doc and yt vids, impossible to get the results in viewport in simulation mode (when it is ok, that isn’t always teh case as eg with 1.)

Hope it is easily understandable (no english fluent), and I hope an answer or proposition of issue, an idea… thank you very much.
Eric

Ok if someone has same problem with Media Player compositing planting when playing viewport simulation, there is something to do with the BP Level Sequencer (told nowhere :smiling_face_with_tear:), here is the issue (french sorry) :

https://www.youtube.com/watch?v=Q12jxnttmfU at 3:14