The iPad as a Media Player
The late Steve Jobs said: The iPad is magical — and without a doubt the best iPod (that is, media player) Apple has ever produced. You can enjoy all your existing media — music, audiobooks, audio and video podcasts, iTunes U courses, music videos, television shows, and movies — on the gorgeous color display found on every iPad ever made (even the oldest iPads have gorgeous color displays).
Here’s the bottom line: If you can get the media file — be it video, audio, or whatever — into iTunes on your Mac or PC, you can synchronize it and watch or listen to it on your iPad. And, of course, you can always buy or rent content on your iPad in the iTunes Store.
Some video content may need to be converted to an iPad-compatible format, with the proper resolution, frame rate, bit rate, and file format to play on your iPad. If you try to sync an incompatible video file, iTunes alerts you that an issue exists.
If you get an error message about an incompatible video file, select the file in iTunes and choose File → Create New Version. When the conversion is finished, sync again.