@Masuibass: I don’t know why this still isn’t documented in the Aximmetry documentation (they should really have done that by now) but you just need to set up your video material like this:

@TwentyStudios

Thank you so much for your precise suggestion!!
It really worked.
And now I feel the dithering was caused by DOF, atomosphere, or something like that.

In my case, the plane with revised material become looking darker and jittering.
So appending the solution, 
- Turn off [Jitter] option
- Additional join [TextureParameter2D] node multipled by 0.3 or 0.4 to [EmmisiveColor]

UE5 is really deep even so much fun!
Thank you for the community and great help.

The issue is mostly caused by Temporal Antialiasing. Aximmetry has made modifications to the source engine to get around this. You shouldn’t have to turn off Jitter if you’ve also set the material to Translucent. Did you do that? 

@TwentyStudios

Thanks for your quick feedback.

Material detail is below:

Actually, the last option you pointed [Render after DOF] is not found.
Instead that I wonder if this option [Translucency pass] is the actual option in UE5.

In my case with above settings, it still jitter.
So I tried to like below:
https://www.youtube.com/watch?v=B6Oaq0aqRmQ (turning off [Jitter] option)

Thanks for your kindness!