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We've got an app we're working on that needs to provide playback of video files via AVPlayer . The files need to be stored on the user's device, but also must playback while downloading. At the moment we've built a download module that uses the ASIHTTPRequest library to get the video files via PHP (we don't want the media to be linkable via public URLs) and write them to disk asynchronously. We've then setup an AVPlayer as per the AV Foundation Programming Guide , getting the file with AVURLAsset, making an AVPlayerItem with the asset, building the AVPlayer with the item, then setting the player to an AVPlayerLayer. The player runs fine with a fully downloaded video file and will also run a progressively downloaded file perfectly well in the simulator . Unfortunately on an actual device, the behavior of the player changes, where instead it seemingly loads the video once and doesn't attempt to grab new packets from disk. The result is that the player will play video and audio up to the point in the video that marks where the download progress was at the time the asset was loaded (e.g. if 2MB of data are buffered then the player is created, the player will only play up to the 2MB worth of data). Because it has the video's header, the player will happily continue thinking it's playing for the full duration of the video, but no other video is rendered to screen. The last wrinkle is that if the video is inserted into an AVComposition and the AVPlayer is created with that, the progressive video will play fine. This would be a

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