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 . The other compression technologies, WMV Screen and WMV Image , cater for specialized content. 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 . Microsoft also developed a digital container format called Advanced Systems Format to store video encoded by Windows Media Video.
25-577: In 2003, Microsoft drafted a video compression specification based on its WMV 9 format and submitted it to SMPTE for standardization. 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. 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 . A WMV file uses
50-701: A DVD player will first have to convert to MPEG-2 before burning a DVD (average file sizes in MPEG-2 are 5 to 6 times the .wmv file). The audio format used in conjunction with Windows Media Video is typically some version of Windows Media Audio , or in rarer cases, the deprecated Sipro ACELP.net audio format. Microsoft recommends that ASF files containing non-Windows Media formats use the generic .ASF file extension. Software that can play WMV files includes Windows Media Player , RealPlayer , MPlayer , Media Player Classic , VLC Media Player and K-Multimedia Player . The Microsoft Zune media management software supports
75-580: A custom block cipher, RC4 stream cipher and the SHA-1 hashing function. Although WMV is generally packed into the ASF container format, it can also be put into the Matroska container format (with file extension .mkv ), or AVI container format (extension .avi ). One common way to store WMV in an AVI file is to use the WMV 9 Video Compression Manager (VCM) codec implementation. Windows Media Video (WMV)
100-518: A few examples are Windows Movie Maker , Windows Media Encoder , Microsoft Expression Encoder , Sorenson Squeeze , Sony Vegas Pro , AVS Video Editor , VSDC Free Video Editor , Telestream Episode , Telestream FlipFactory , and FFmpeg . Programs that encode using the WMV Image format include Windows Media Encoder , AVS Video Editor , and Photo Story . While none of the WMV formats themselves contain any digital rights management facilities,
125-586: 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 MPEG transport stream or RTP packet format. The format is not compatible with previous WMV 9 formats, however. WMV is a mandatory video format for PlaysForSure -certified online stores and devices, as well as Portable Media Center devices. The Microsoft Zune , Xbox 360 , Windows Mobile -powered devices with Windows Media Player, as well as many uncertified devices, support
150-413: A visual explanation of the content presented. Open-source tools exist for both screencasting and livestreaming the recorded video. Trial versions of screencasting programs often apply a watermark , encouraging users to purchase the full version in order to remove it. An alternative solution for capturing a screencast is the use of a hardware RGB or DVI frame grabber card. This approach places
175-575: Is a video slideshow format. The format works by applying timing, panning 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 frames per second at 1024 px × 768 px resolution) requires heavy computer processing. The latest version of
200-506: Is now the most generic term. Screencasts can help demonstrate and teach the use of software features. Creating a screencast helps software developers show off their work. Educators may also use screencasts as another means of integrating technology into the curriculum. Students can record video and audio as they demonstrate the proper procedure to solve a problem on an interactive whiteboard. Screencasts are useful tools for ordinary software users as well: They help filing report bugs in which
225-509: Is the most recognized video compression format within the WMV family. Usage of the term WMV often refers to the Microsoft Windows Media Video format only. Its main competitors are MPEG-4 AVC , AVS , RealVideo , and MPEG-4 ASP . The first version of the format, WMV 7, was introduced in 1999, and was built upon Microsoft's implementation of MPEG-4 Part 2 . Continued proprietary development led to newer versions of
250-665: Is usually not achieved by a video camera that records the desktop. In classrooms, teachers and students can use this tool to create videos to explain content, vocabulary, etc. Videos can make class time more productive for both teachers and students. Screencasts may increase student engagement and achievement and also provide more time in which students can work collaboratively in groups, so screencasts help them to think through cooperative learning. In addition, screencasts allow students to move at their own pace since they can pause or review content anytime and anywhere. Screencasts are excellent for those learners who just need an oral as well as
275-531: The Advanced Systems Format (ASF) container format 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 file extension and not the .wmv file extension. The ASF container can optionally support digital rights management using a combination of elliptic curve cryptography key exchange, DES block cipher,
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#1732780898645300-461: The 3rd party Flip4Mac , a QuickTime Component developed by Telestream that allowed Macintosh users to play WMV files in any player that used the QuickTime framework. Telestream ended sales of Flip4Mac on 1 July 2019 and officially ended support on 28 June 2020. The Elmedia player, which can play WMV files on Macintosh computers, is still available. Many programs can export video in WMV format;
325-466: The ASF container format, in which a WMV stream may be encapsulated, can. Windows Media DRM, which can be used in conjunction with WMV, supports time-limited subscription video services such as those offered by CinemaNow . Windows Media DRM, a component of PlaysForSure and Windows Media Connect , is supported on many modern portable video devices and streaming media clients such as the Xbox 360. WMV has been
350-569: The WMV format, but uses a Zune-specific variation of Windows Media DRM which is used by PlaysForSure. Many third-party players exist for various platforms such as Linux that use the FFmpeg implementation of the WMV format. On the Macintosh platform, Microsoft released a PowerPC version of Windows Media Player for Mac OS X in 2003, but further development of the software ceased. From January 2006 to May 2014, Microsoft endorsed and distributed
375-416: The details below. Request from 172.68.168.236 via cp1112 cp1112, Varnish XID 945357952 Upstream caches: cp1112 int Error: 429, Too Many Requests at Thu, 28 Nov 2024 08:01:38 GMT Screencast A screencast is a digital recording of computer screen output, also known as a video screen capture or a screen recording , often containing audio narration . The term screencast compares with
400-438: The format, WMV 9.1 Image, used by Photo Story 3, features additional transformation effects, but is not compatible with the original WMV 9 Image format. Hardware support for WMV Image is available from Portable Media Centers, Windows Mobile -powered devices with Windows Media Player 10 Mobile. Since no known domestic DVD player supports this format, users of Photo Story 3 wishing to generate material capable of being played in
425-431: The format, but the bit stream syntax was not frozen until WMV 9. 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 . WMV 9 also introduced a new profile titled Windows Media Video 9 Professional , which is activated automatically whenever
450-590: The format. WMV HD 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 Microsoft Silverlight platform, but the H.264 format is now also supported starting with version 3. Windows Media Video Screen (WMV Screen) are video formats that specialise in screencast 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
475-401: The related term screenshot ; whereas screenshot generates a single picture of a computer screen, a screencast is essentially a movie of the changes over time that a user sees on a computer screen, that can be enhanced with audio narration and captions. In 2004, columnist Jon Udell invited readers of his blog to propose names for the emerging genre. Udell selected the term "screencast", which
500-405: The screencasts take the place of potentially unclear written explanations; they help showing others how a given task is accomplished in a specific software environment. Organizers of seminars may choose to routinely record complete seminars and make them available to all attendees for future reference and/or sell these recordings to people who cannot afford the fee of the live seminar or do not have
525-546: The source material is mainly static and contains a small color palette . 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 Live Meeting 2007. FourCCs for the formats are MSS1 , MSS2 and MSA1 . Windows Media Video Image (WMV Image)
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#1732780898645550-582: The subject of numerous complaints from users and the press. Users dislike the digital rights management system which is sometimes attached to WMV files. In 2007, the loss of the ability to restore licenses for WMV files in the Windows Media Player 11 was not positively received. Video compression specification Too Many Requests If you report this error to the Wikimedia System Administrators, please include
575-426: The time to attend it. This will generate an additional revenue stream for the organizers and makes the knowledge available to a broader audience. This strategy of recording seminars is already widely used in fields where using a simple video camera or audio recorder is insufficient to make a useful recording of a seminar. Computer-related seminars need high quality and easily readable recordings of screen contents which
600-514: 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 1 Mbit/s. It is targeted towards high-definition video content, at resolutions such as 720p and 1080p . The Simple and Main profile levels in WMV 9 are compliant with the same profile levels in the VC-1 specification. The Advanced Profile in VC-1 is implemented in
625-514: Was proposed by both Joseph McDonald and Deeje Cooley. The terms "screencast," " screencam " and "screen recording" are often used interchangeably, due to the market influence of ScreenCam as a screencasting product of the early 1990s. ScreenCam, however, is a federal trademark in the United States , whereas screencast is not trademarked and has established use in publications as part of Internet and computing vernacular. Screen recording
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