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This article is about video encoding and decoding software. For container file format, see. Windows Media Video ( WMV) is a series of and their corresponding developed. It is part of the framework. Contoh Program Pointer Dengan Pascal here. 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. The other compression technologies, WMV Screen and WMV Image, cater for specialized content. After standardization by the (SMPTE), WMV version 9 was adopted for physical-delivery formats such as and and became known as.
Microsoft also developed a called to store video encoded by Windows Media Video. Main article: A WMV file uses the (ASF) to encapsulate the encoded multimedia content. While the ASF can encapsulate multimedia in other encodings than those the WMV file standard specifies, those ASF files should use the.ASF and not the.WMV file extension. The ASF container can optionally support using a combination of key exchange, block cipher, a custom block cipher, stream cipher and the hashing function. Although WMV is generally packed into the ASF container format, it can also be put into the or container format.
The resulting files have the.MKV and.AVI file extensions, respectively. One common way to store WMV in an AVI file is to use the WMV 9 codec implementation. 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. Windows Media Video (WMV) is the most recognized within the WMV family. Usage of the term WMV often refers to the Microsoft Windows Media Video format only. Its main competitors are,,, and. The first version of the format, WMV 7, was introduced in 1999, and was built upon Microsoft's implementation of. Continued proprietary development led to newer versions of the format, but the syntax was not frozen until WMV 9.
While all versions of WMV support,, and, WMV 9 introduced several important features including native support for, non-square, and. 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 [ ]. It is targeted towards high-definition video content, at resolutions such as and. The Simple and Main profile levels in WMV 9 are compliant with the same profile levels in the specification. The Advanced Profile in VC-1 is implemented in a new WMV format called Windows Media Video 9 Advanced Profile. It improves compression efficiency for interlaced content and is made transport-independent, making it able to be encapsulated in an or packet format. The format is not compatible with previous WMV 9 formats, however.
WMV is a mandatory video format for -certified online stores and devices, as well as devices. The,, -powered devices with Windows Media Player, as well as many uncertified devices, support the format. Mandates the use of WMV 9 for its certification program, at quality levels specified by Microsoft.
WMV used to be the only supported video format for the platform, but the H.264 format is now also supported starting with version 3. Windows Media Video Screen [ ] Windows Media Video Screen (WMV Screen) are video formats that specialise in content. They can capture live screen content, or convert video from third-party screen-capture programs into WMV 9 Screen files.
They work best when the source material is mainly static and contains a small color. One of the uses for the format is computer step-by-step demonstration videos. The first version of the format was WMV 7 Screen. The second version, WMV 9 Screen, supports VBR encoding in addition to CBR. Additionally there is MSA1 (aka “MS ATC Screen codec” or “MSS3”) which is used in 2007.
For the formats are MSS1, MSS2 and MSA1. Windows Media Video Image [ ] Windows Media Video Image (WMV Image) is a video format. The format works by applying timing, and transition effects to a series of images during playback. The codec achieves a higher compression ratio and image quality than WMV 9 for still images as files encoded with WMV Image store static images rather than full-motion video. Since the format relies on the decoder (player) to generate video frames in real-time, playing WMV Image files even at moderate resolutions (e.g. 30 at 1024 px × 768 px resolution) requires heavy computer processing.