I don't think that the intent is to merge the two. Typically, VR scenes using an alpha channel are in a fisheye format with the alpha mask living in the black space between the fisheye views. The primary scene is not fisheye. So, there is no place to put the alpha mask into the primary track. This appears to be something similar to the .hsp (heresphere) files that CzechVR uses for their passthrough. For CzechVR, the "rule" is that the .hsp file needs to have the same name as the video file, but with a .hsp suffix rather than .mp4.Here is one with both the video and mask. Any way to play it and merge it together?
ARPorn recommends Play'A. So it's likely a file that is compatable with that software. I couldn't find any instructions on the VRPorn website. I haven't looked at the Play'A website.
