what file formats will itunes play
For audio files, iTunes U supports .m4a and .mp3 files. For video files, iTunes U supports only MPEG-4 (.mp4, .m4v, or .mov) with H.264 compression. Video podcasts in .mov format will not play on most iPods and portable devices. To ensure compatibility with mobile devices, use only MPEG-4 (.mp4 or .m4v) formats with H.264 compression.