With the new iPhones and accompanying new OS for older iPhones, you can now access iTunes U on your iPhone. What I've discovered, however, is that for many videos in iTunes U and for most of our UA videos I get "This movie format is not supported."
We probably have 1,000+ videos in our iTunes U site and they have worked correctly in iTunes; they have synced correctly and played on video iPods, including the Touch. Our videos have conformed to Apple's required specs: MPEG4 with H.264 and Heather, who leads the LTC Media Services team, has established guidelines for settings (data rate, frame rate,& key frame) that result in the best quality for 640 pixel wide displays while achieving the lowest file size. For example, Paul Cohen's "Science that Tranforms" lecture is 54 minutes long and is 264MB [bit rate=103kbps, total bit rate=674kbps, profile=low complexity, channels=stereo].
I consulted with an Apple iTunes U manager who said that our videos are "out of spec for iPods or iPod app on iPhone or iPod touch" and pointed me to the admin guide http://tinyurl.com/lgyn22 where it says "it is recommended that your source file is at least 640 pixels wide and that you use the built-in iPod converters in Compressor ("H.264 for iPod"), QuickTime Pro ("Movie to iPod"), or iTunes ("Convert Selection for iPod")." When I converted the Paul Cohen lecture in iTunes using "create iPod or iPhone version" it took approximately two hours on my new iMac . The file size for the converted version is 484MB. If we face a ceiling of 500MB for files, this is not an attractive solution. Plus, it greatly increases download time for users and we face breaking our videos into parts. Dividing video of a lecture into parts is something that we have avoided unless the videos are over an hour long. Heather can also create the video according to Apple's requirements for playing on the iPhone but it will take much longer to compress/encode.
I've been looking at other videos uploaded to the UA's iTunes U and found that UA News videos play on the iPhone. These videos average 2:30 and seem to be about 25MB. If you do the math, an hour using these encoding rates will run up to ~500MB. Michael Griffith in the College of Medicine told me that he has not used the pre-sets in the Podcast Producer he is running for College of Med videos to accommodate iPhones, likely to keep the file size down.
BTW, it is definitely not just our UA iTunes U videos that won't play on the iPhone. There are two icons on the iTunes U splash when I access it from my iPhone - one the U. Cambridge Fitzwilliam Museum audio tracks about Darwin and UCTV's The Mind Body Connection. I attempted to view one of the UCTV videos and got the "This movie format is not supported" message.
I'm sure Apple engineered the iPhones this way for a good reason. We're discussing how best to manage this and will follow the discussion forum topic to see if any ideas come forward from other sites.