If the player can't guess the file format you need to check that the CDN sends the right mime type back. My guess is that your CDN can't guess the mimetype correctly nor can the player.
IPhone support video H.264, MPEG-4 in . Mp4, . M4v, .
Mov formats and audio files in AAC, MP3, M4a, Apple lossless and Audible. You can use NSFileManager's -contentsOfDirectoryAtPath:error: method to get an array with the contents of a directory (as strings). Then you just do strings operations .
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.