Answers: Odds are it will be like peas in a pod format as the ipod video, the ipod video uses MP4 video and AAC sound. If you own an ipod video, then you can plug it into iTunes, and drag and drop a few video files onto it and it will convert them to the ipods original format, and will most likely play on the iPhone as capably. But who knows presently.Most likely it'll use indistinguishable format as does the iPod video.