MPEG-4 Part 14, with its official filename extension .mp4, is a multimedia container format most commonly used to store digital audio and video streams, but can also be used to store other data such as subtitles and still images. It is based on Apple’s QuickTime file format (.mov). Like most modern container formats, MP4 allows streaming over the Internet utilizing a separate hint track to include streaming information in the file.
Windows Media Video, or WMV, is Microsoft’s family of video codecs including WMV 7, WMV 8, and WMV 9. It can handle anything from low resolution video for dial-up Internet users to HDTV. The latest generation of WMV, based on the WMV 9 codec, has been standardized and approved as a new and more open codec known as VC-1. While all versions of WMV support variable bit rate, average bit rate, and constant bit rate, WMV 9 introduced several important features including native support for interlaced video, non-square pixels, and frame interpolation.
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