Runtime loading of Alpha channel web video possible on Android?

Hello,

My app downloads alpha channel enabled web videos to show view previews. It works fine on iOS but the alpha channel is not respected on Android. If I bake the video into the project then I can choose a transcode option which apparently works but I need to load these videos at runtime not compile time.

Has anyone managed to do this? I'm going to have to rethink my whole app if this doesn't work on Android.

Thanks in advance.