The weird thing is that I do NOT have the HBO app in my TV. And I can Cast from the computer using Chrome (no mirroring). And then my phone and my tv remote can be used to stop/play the movie. I can record a video if you want. I have no idea how they do the trick. It seems almost like the HBO app was in the Android-TV but I checked and I cannot find it. It’s almost dark magic. The Netflix, Amazon Prime and Youtube Apps are installed but I can try another streaming website (maybe Filmin) to see if it does the same.
But I understand it may stream the video from the cloud directly to the TV. Mirroring (sending the video on local) will cause delay. Could EasyRPG do the same IF the game is in the browser Player?