ABSTRACT
Downloading files requires that the whole video is either first downloaded or, if the CODEC allows for it, will start playing back as the video is being downloaded, a feature known as progressive download. The MPEG4 format has progressive download built into the architecture. This allows for rented movies to start playing within a couple of minutes of selecting the title on your iPad. You do not need to wait for two to three hours for the whole movie to download.
