Video Alpha Transparency not working on some Android 10 versions

Hi !
I am trying to run an app that includes a video player with alpha transparency. I have set the alpha transparency parameters with the transcode tool as seen on various threads.

I have tried with and without the alpha transparency option : the video is playing well without, but does not play at all with alpha transparency (quad remaining with material color).

I tried it on 2 different Android versions :
- A Xiaomi Redmi note 8 pro with Android 10 .QP1A.190711.020 (supposed to be the latest built) --> NOT WORKING
- A Fairphone with android 10 (dont know which version as they have their own built) --> WORKING

Any idea what the issue could be ? I dont really know what are my options here to investigate...

I am running Unity on a PoPOS (Ubuntu..) laptop.

Thanks a lot !
Félix

 

Hi again,
I have somehow found a solution to this : I had to reduce the Spatial Quality to "Low" when importing the video.
It is quite strange as the other phones on which I have tested this are much less powerful (less RAM, lower CPU and GPU) than the Xiaomi phone I have had the issue with.
But by setting the Spatial Quality to low, it now works on this phone, not so sure why.

When I set the spatial quality to a higher value, the Quad on which the video should be played is just white.

Hope it can help someone.