We've had a couple of our users ask if they could composite (A over B) two images when encoding from EXR to a movie format (like H.264). Typically, when you try to create a movie from source images that have a lot of transparency, the images are comp'd over a black background. My guess is this is probably done by the encoder by default. However, our users want to specify a different color like gray. They don't necessarily need to do any real compositing, like providing separate sets of images, but they would like to alter the background color when encoding a movie. Is this currently possible with rvio? I didn't see anything obvious while looking through the help.
(EDIT: this is currently done by comping the images in Nuke and then sending them off to rvio, it would excellent to skip that step)