I downloaded some
MP4 on iPad but they can't be played. Apple clearly said that supports MP4 format, but why my iPad can't play?
You can download video player from app store. MX player is a very popular video player. You will be able to play not only MP4 but many more format as well. You might be able to play videos in dual audios as well. I hope my solution helps. If you would like to learn
how to reset a forgotten apple id password you can check out my article.
Use VLC player or MX Player both are available for iPhone users.