As the title says... ... I have a bunch of video files in the MP4 container format and according to the person who encoded them, they were all encoded in H.264 'High' Profile. The video plays fine using QuickTime player, but by looking at the into palette withing QuickTime, the video track data size & data rate reported by QuickTime is reporting the file size as ZERO bytes. Same deal when viewing the info palette from MPEG StreamClip (which I believe uses QuickTime API as well). So if I attempt to transcode the video files into Apple TV friendly format (which apparently only supports 'Main' profile H.264) I get no video. It seems anything that uses the QuickTime API cannot deal with this video track - but oddly enough plays it okay, it just can't use it for manipulation? I wondered initially if this was a problem with the authors workflow and producing a slightly corrupt file header, but I'm starting to get the impression that fundamentally this is a limitation of QuickTime itself not supporting the High profile... Many thanks for any information. L.