WMV 9 also introduced a new profile titled Windows Media Video 9 Professional, which is activated automatically whenever the video resolution exceeds 300,000 pixels (e.g., 528 px × 576 px, 640 px × 480 px or 768 px × 432 px and beyond) and the bitrate 1000 kbit/s. 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. Continued proprietary development led to newer versions of the format, but the bit stream syntax was not frozen until WMV 9. The first version of the format, WMV 7, was introduced in 1999, and was built upon Microsoft's implementation of MPEG-4 Part 2. Its main competitors are MPEG-4 AVC, AVS, RealVideo, and MPEG-4 ASP. Usage of the term WMV often refers to the Microsoft Windows Media Video format only. Windows Media Video (WMV) is the most recognized video compression format within the WMV family.
Diagram illustrating the relative frame sizes of several common video resolutions targeted by Windows Media Video 9 Professional, starting with 480p.
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