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Windows Media Video (WMV) is a series of video codecs and their corresponding video coding formats developed by Microsoft.It is part of the Windows Media framework. 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.
Windows Media High Definition Video (WMV HD) is the marketing name for high definition videos encoded using Microsoft Windows Media Video 9 codecs. These low-complexity codecs make it possible to watch high definition movies in 1280×720 ( 720p ) or 1920×1080 ( 1080p ) resolutions on many modern personal computers running Microsoft Windows XP ...
That is the case with some video file formats, such as WebM (.webm), Windows Media Video (.wmv), Flash Video (.flv), and Ogg Video (.ogv), each of which can only contain a few well-defined subtypes of video and audio coding formats, making it relatively easy to know which codec will play the file.
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
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Audio Video Interleave (also Audio Video Interleaved and known by its initials and filename extension AVI, usually pronounced / ˌ eɪ. v iː ˈ aɪ / [3]) is a proprietary multimedia container format and Windows standard [4] introduced by Microsoft in November 1992 as part of its Video for Windows software.
In addition, WMA Pro is a requirement for the WMV HD certification program. [34] On the software side, Verizon utilizes WMA 10 Pro for its V CAST Music Service, [ 35 ] and Windows Media Player 11 has promoted the codec as an alternative to WMA for copying audio CD tracks. [ 36 ]
MPEG-4 is a group of international standards for the compression of digital audio and visual data, multimedia systems, and file storage formats. It was originally introduced in late 1998 as a group of audio and video coding formats and related technology agreed upon by the ISO/IEC Moving Picture Experts Group (MPEG) (ISO/IEC JTC 1/SC29/WG11) under the formal standard ISO/IEC 14496 – Coding ...