@forteller The problem with doing this in video would probably seeking. You have to put the "extra" data somewhere. With a picture, you can the smaller resolution data at the beginning of the file, and then just stop when you have enough. It can load progressivly. With video that would mean you'd have to have all the data for 720p first, then the extra 1080p data after that, etc. But since you need all the data per frame for full quality, you'd have to jump around in a huge file.