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.
Video compression formats Windows Media Video Diagram illustrating the relative frame sizes of several common video resolutions targeted by Windows Media Video 9 Professional, starting with 480p. One common way to store WMV in an AVI file is to use the WMV 9 Video Compression Manager (VCM) codec implementation. mkv), or AVI container format (extension. The ASF container can optionally support digital rights management using a combination of elliptic curve cryptography key exchange, DES block cipher, a custom block cipher, RC4 stream cipher and the SHA-1 hashing function.Īlthough WMV is generally packed into the ASF container format, it can also be put into the Matroska container format (with file extension. While the ASF can encapsulate multimedia in other encodings than those the WMV file standard specifies, those ASF files should use the. Container format Ī WMV file uses the Advanced Systems Format (ASF) container format to encapsulate the encoded multimedia content. VC-1 became one of the three video formats for the Blu-ray video disc, along with H.262/MPEG-2 Part 2 and H.264/MPEG-4 AVC. The standard was officially approved in March 2006 as SMPTE 421M, better known as VC-1, thus making the WMV 9 format an open standard. In 2003, Microsoft drafted a video compression specification based on its WMV 9 format and submitted it to SMPTE for standardization. Microsoft also developed a digital container format called Advanced Systems Format to store video encoded by Windows Media Video. After standardization by the Society of Motion Picture and Television Engineers (SMPTE), WMV version 9 was adapted for physical-delivery formats such as HD DVD and Blu-ray Disc and became known as VC-1. The other compression technologies, WMV Screen and WMV Image, cater for specialized content. WMV consists of three distinct codecs: The original video compression technology known as WMV, was originally designed for Internet streaming applications, as a competitor to RealVideo. It is part of the Windows Media framework.
#ADVANCED AUDIO CODEC WINDOWS MEDIA PLAYER SERIES#
Windows Media Video ( WMV) is a series of video codecs and their corresponding video coding formats developed by Microsoft. This article is about video encoding and decoding software.
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