With the wide screen and large capacity, iPhone is definitely a good video player to enjoy movie or video clips. But not all video files can be directly viewable on iPhone because iPhone only supports the below video format.

H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;

MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;

Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format

But how can we watch any video on iPhone?

We use iTunes account to purchase videos for iPhone. In this way you need to set up iPhone and sync media via iTunes. Video content include DVD movie, video clips, MTV, and more.

Second, we can watch and download YouTube videos through Wi-Fi network. More than 10,000 YouTube videos that can be directly played on iPhone, however, not all YouTube videos are in H264 video format and lots of them is not able to direct download via iPhone. If you want to enjoy all YouTube videos on iPhone, you have to pay for $20 per month.

Excepting buying movies from iTune store and YouTube, the third way is that we can use professional iPhone video converter software to enjoy any video through converting them into .mp4 file formats. When we are searching the video converter software, we’d better purchase the program that can support converting DVD video, HD video, and video in various formats such as mpg, mpe, mkv, avi, asf, flv, vob, dat, mov, 3gp etc.