There was an issue with some external texture support extension versions (like on Adreno 330) which was fixed in 4.18.2. Also make sure if you are using a UMG widget to show the external texture you make a Slate material to sample the mediatexture and connect that to the widget instead of directly using the mediatexture.
The one thing I notice is you try to rewind and play right after open; you have to wait for the OnMediaOpened event before doing this since we now use async prepare.
done this, will I be able to run the game on devices opengl es 3.0?
same problem with 4.18.3 and 4.19
is there an official sample that I can test?
work with 4.19.0 preview 2
Glad to hear it!