I've created a short graphical sequence in after effects which I need to export with transparent areas, in order to place into a media player which will have dynamic text feeds and pictures in the background. This will then be displayed on a portrait lcd at 720x1280.
This isn't a problem with a an uncompressed avi, by rendering RGB+Alpha, but the file size becomes unfeasible (1.7GB). The ideal encoding format is wmv, but I can't find any way of retaining the transparency.
Am I deluding myself that wmv files can do this? And if not, are there any other formats which do allow transparency?