When compressing to DXV3 normal or high Quality with mpeg streamclip on MacOS the Alpha Channel is lost. Resolume shows in the information "with Alpha Channel" but the Background isn´t transparent.....
That's the same old StreamClip bug that has been around for ever. It cannot batch convert files and retain the alpha channel - it couldn't do it with DXV2 and it still can't with DXV3
Oops. Never heard about that mpeg streamclip bug in batch mode....and never used it before with alpha.Thanks for the hint.....Automask with Black an White elements is not the best solution
SOLVED