Windows Media Video (WMV) is a file type which can contain video in one of several video compression formats developed by Microsoft. The original video compression format used in the file, also known as WMV, was originally designed for Internet streaming applications, as a competitor to Real Video. The other compression formats, such as WMV Screen and WMV Image, cater for specialized content. Through standardization from the Society of Motion Picture and Television Engineers (SMPTE), WMV9 has gained adoption for physical-delivery formats such as HD DVD and Blu-ray Disc. Though sometimes used interchangeably, note the distinction between Windows Media, the file type, and Windows Media Video, the video compression format. Windows Media the file type is a container (in the Advanced Systems Format) which can contain video in one of several different video compression format, only one of which is the Windows Media Video video compression format, alongside audio in an audio coding format.
MPEG-1 is a standard for lossy compression of video and audio. It is designed to compress VHS-quality raw digital video and CD audio down to 1.5 Mbit/s (26:1 and 6:1 compression ratios respectively) without excessive quality loss, making video CDs, digital cable/satellite TV and digital audio broadcasting(DAB) possible. Today, MPEG-1 has become the most widely compatible lossy audio/video format in the world, and is used in a large number of products and technologies. Perhaps the best-known part of the MPEG-1 standard is the MP3 audio format it introduced.