How to use set up transparent background on VSE (alpha file combined with mp4) I received one of my very short clips edited from Unscreen website (which removes background of the vid) but they sent me the mp4 of the video (with the background) and an alpha file which I have no idea how to work with on blender (neither on any other software anyway!)
I want to import my video with a transparent background and apparently I have to mix somehow the mp4 and the alpha file.
Does anyone can tell me a simple procedure to do so on VSE?
Thanks in advance
Roland
As mp4 doesn't support alpha channel, the file you have is a black and white movie that brings the alpha information.
White means matte, while black means transparent.
In Blender compositor (or any other) you can plug it into a color mix node, where black will bring the top input image, white the bottom input.
In VSE you can add a mask modifier to the video strip that needs transparency, targeting the alpha strip.
Alpha strip has to stay under the visible strips.