Rendering videos with Alpha Channel or transparency is very important, especially when you are creating your own stock media pack. If you have previously used Video Copilot Action Essential Pack 2, you will notice that all the stock video clips are pre-matte, i.e. they are rendering with Alpha channel, or in easy words – Video clips are transparent so that you can easily composite them over your own footage.
Rendering Videos with Alpha Channel
Videos need to be rendered out in ‘.mov‘, commonly known as QuickTime format in order to preserve the transparency. Basically, all you need to do is change your output format to QuickTime and Video Output channel to RGB+ALPHA. By default, it is RGB. RGB+ALPHA means that our video output should contain all the elements in RGB color space and well as those with Alpha (transparency) and the file size you will get will be large enough since QuickTime output generates uncompressed data.
It is not possible to render out videos in a compressed format like h.264 with RGB as well as Alpha Channel both. You can either render RGB or Alpha.