Contents 1 History 2 Container format 3 Video compression formats 3.1 Windows Media Video 3.2 Windows Media Video Screen 3.3 Windows Media Video Image 3.4 Versions 4 Audio compression formats 5 Players 6 Encoders 7 Digital rights management 8 Criticism 9 See also 10 References 11 External links

History[edit] 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.[3][4]

Container format[edit] Main article: Advanced Systems Format A WMV file uses 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.[5] 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. Although WMV is generally packed into the ASF container format, it can also be put into the Matroska[6] or AVI 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 Video Compression Manager (VCM) codec implementation.[7][8]

Video compression formats[edit] Windows Media Video[edit] Diagram illustrating the relative frame sizes of several common video resolutions targeted by Windows Media Video 9 Professional, starting with 480p. Windows Media Video (WMV) 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.[9] Continued proprietary development led to newer versions of the format, but the bit stream syntax was not frozen until WMV 9.[10] 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.[11] WMV 9 also introduced a new profile titled Windows Media Video 9 Professional,[12] 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[citation needed]. 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.[13] 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 MPEG transport stream or RTP packet format. The format is not compatible with previous WMV 9 formats, however.[14] 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 the format.[15] WMV HD mandates the use of WMV 9 for its certification program, at quality levels specified by Microsoft.[16] 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.[17] Windows Media Video Screen[edit] 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 the source material is mainly static and contains a small color palette.[18] 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.[18] 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.[19] Windows Media Video Image[edit] Windows Media Video Image (WMV Image) is a video slideshow format. The format works by applying timing, panning and transition effects to a series of images during playback.[20] 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 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.[20] Hardware support for WMV Image is available from Portable Media Centers, Windows Mobile-powered devices with Windows Media Player 10 Mobile.[15] Since no known domestic DVD player supports this format, users of Photo Story 3 wishing to generate material capable of being played in 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). Versions[edit] Public Name FourCC Description Microsoft MPEG-4 version 1 MPG4 Video for Windows-based codec. Non-standard MPEG-4 codec incompatible with the later standardized version of MPEG-4 Part 2. Microsoft MPEG-4 version 2 MP42 VfW-based codec. Non-compliant with finalized MPEG-4 part 2 standard. Microsoft MPEG-4 version 3 MP43 VfW-based codec. Non-compliant with finalized MPEG-4 part 2 standard. Eventually locked for encoding only with ASF files (build 3688 and earlier could also encode to AVI).[21] Microsoft ISO MPEG-4 version 1 MP4S DirectX Media Objects (DMO)-based codec. MPEG-4 Simple Profile compliant. Microsoft ISO MPEG-4 version 1.1 M4S2 MPEG-4 Advanced Simple Profile compliant.[22] Windows Media Video 7 WMV1 DMO-based codec. Windows Media Screen 7 MSS1 DMO-based codec. Optimized for low-bitrate sequential screen captures or screencasts. Deprecated in favor of Windows Media 9 Screen codec. Windows Media Video 8 WMV2 DMO-based codec. Windows Media Video 9 WMV3 DMO-based codec. Video for Windows (VfW/VCM) version also available. [2] Windows Media Video 9 Screen MSS2 DMO-based codec. Optimized for low-bitrate sequential screen captures or screencasts. Windows Media Video 9.1 Image WMVP DMO-based codec. Optimized for encoding video from sequential bitmap images. Used, for instance, by Photo Story. Windows Media Video 9.1 Image V2 WVP2 DMO-based codec. Optimized for encoding video from sequential bitmap images. Used, for instance, by Photo Story. Windows Media Video 9 Advanced Profile WMVA DMO-based codec. Deprecated as non-VC-1-compliant. Windows Media Video 9 Advanced Profile WVC1 DMO-based codec. VC-1 compliant format.

Audio compression formats[edit] 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 audio format. Microsoft recommends that ASF files containing non-Windows Media formats use the generic .ASF file extension.

Players[edit] 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 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,[23] but further development of the software has ceased. Microsoft currently endorses the 3rd party Flip4Mac WMV, a QuickTime Component which allows Macintosh users to play WMV files in any player that uses the QuickTime framework, free of charge to view files but chargeable to convert formats.[24] The WMV installer is bundled with Microsoft Silverlight by default, installation without Silverlight can be accomplished with a "Custom" install. According to the Flip4Mac website, WMV files with DRM encryption are not compatible with the component.

Encoders[edit] Software that exports video in WMV format include Windows Movie Maker, Windows Media Encoder, Microsoft Expression Encoder, Sorenson Squeeze,[25] Sony Vegas Pro,[26] AVS Video Editor, VSDC Free Video Editor, Telestream Episode, Telestream FlipFactory and early versions of Adobe Premiere Pro and Adobe After Effects, .[27][28] Programs that encode using the WMV Image format include Windows Media Encoder, AVS Video Editor, and Photo Story.

Digital rights management[edit] Main article: Windows Media DRM While none of the WMV formats themselves contain any digital rights management facilities, 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.[29] 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.

Criticism[edit] WMV has been the subject of numerous complaints from users and the press. Users dislike the digital rights management system which is sometimes attached to WMV files.[30] The loss of the ability to restore licenses for WMV files in the Windows Media Player 11 was not positively received.[30] In addition, the Microsoft Zune does not support the standard Windows Media DRM system, rendering protected WMV files unplayable.[31]

See also[edit] JPEG XR / HD Photo, an image file format and format developed by Microsoft

References[edit] ^ SMPTE VC-1 Receiving Industrywide Support ^ Microsoft VC-1 Codec Now a Standard ^ a b Blu-ray Disc BD-ROM Specification Adds Microsoft's VC-1 Advanced Video Codec ^ a b Microsoft Technology Brings HD DVD to the Mainstream ^ MSDN: The Difference Between ASF and WMV/WMA Files ^ "Archives | Matroska". 2003-06-19. Retrieved 2011-10-12. As a sidenote, his muxer filter will also allow transmuxing of Microsoft WMV9 video files ( ASF/WMV container ) fine into matroska files, from Graphedit, and with WMV9 VCM installed on your PC you can even open and edit the files in latest VirtualdubMod  ^ Microsoft Corporation (2003-07-07) Windows Media Video 9 VCM, Retrieved on 2009-08-07 ^ Windows Media Video 9 Series Codecs: Windows Media Video 9 VCM ^ MPEG-4 makes the scene ^ Windows Media Audio & Video 9 Series ^ Microsoft Windows Media - Demos Video Quality ^ Windows Media 9 Series Beta Reviewer's Guide ^ Using the Advanced Settings of the Windows Media Video 9 Advanced Profile Codec ^ Best Practices for Windows Media Encoding ^ a b Windows Media Player Mobile FAQ ^ WMV HD DVD Encoding Profile Guidelines ^ Microsoft Silverlight Developer Server Audio Video Streaming FAQ ^ a b Windows Media Video 9 Series Codecs: Windows Media Video 9 Screen ^ ^ a b Windows Media Video 9 Series Codecs: Windows Media Video 9 Image Version 2 ^ VirtualDub VirtualDub documentation: codecs, Retrieved on 2009-11-28 ^ MPEG4 Part 2 Video Decoder MSDN documentation: Profiles and Levels, Retrieved on 2009-11-28 ^ Windows Media Player 9 for Mac OS X ^ Important information for Windows Media Player for Mac users ^ Sorenson Media ^ Sony Creative Software - Vegas Pro 8 - Technical Specifications ^ Supported file formats in Adobe Premiere Pro 2.0 ^ [1] ^ PlaysForSure: CinemaNow ^ a b Microsoft Media Player shreds your rights ^ Zune won't play MS DRM infected files

External links[edit] Wikimedia Commons has media related to Windows Media Video. Description of the algorithm used for Windows Media encryption Demonstration of WMV 9 delivering 720p video at 1.8 mbit/s ABR Demonstration of WMV 9 delivering 1080p video at 10 mbit/s ABR History of Windows Media Player (archived 2009) v t e Multimedia compression and container formats Video compression ISO/IEC MJPEG Motion JPEG 2000 MPEG-1 MPEG-2 Part 2 MPEG-4 Part 2/ASP Part 10/AVC MPEG-H Part 2/HEVC ITU-T H.120 H.261 H.262 H.263 H.264 H.265 SMPTE VC-1 VC-2 VC-3 VC-5 Alliance for Open Media AV1 Others Apple Video AVS Bink Cinepak Daala Dirac DV DVI FFV1 Huffyuv Indeo Lagarith Microsoft Video 1 MSU Lossless OMS Video Pixlet ProRes 422 ProRes 4444 QuickTime Animation Graphics RealVideo RTVideo SheerVideo Smacker Sorenson Video, Spark Theora Thor VP3 VP6 VP7 VP8 VP9 WMV XEB YULS Audio compression ISO/IEC MPEG-1 Layer III (MP3) MPEG-1 Layer II Multichannel MPEG-1 Layer I AAC HE-AAC AAC-LD MPEG Surround MPEG-4 ALS MPEG-4 SLS MPEG-4 DST MPEG-4 HVXC MPEG-4 CELP MPEG-D USAC MPEG-H 3D Audio ITU-T G.711 (A-law, µ-law) G.718 G.719 G.722 G.722.1 G.722.2 G.723 G.723.1 G.726 G.728 G.729 G.729.1 IETF Opus iLBC 3GPP AMR AMR-WB AMR-WB+ EVRC EVRC-B EVS GSM-HR GSM-FR GSM-EFR Others ACELP AC-3 AC-4 ALAC Asao ATRAC CELT Codec2 DRA DTS FLAC iSAC Monkey's Audio TTA True Audio MT9 Musepack OptimFROG OSQ QCELP RCELP RealAudio RTAudio SD2 SHN SILK Siren SMV Speex SVOPC TwinVQ VMR-WB Vorbis VSELP WavPack WMA MQA aptX LDAC Image compression IEC, ISO, ITU-T, W3C, IETF CCITT Group 4 GIF HEIF HEVC JBIG JBIG2 JPEG JPEG-LS JPEG 2000 JPEG XR JPEG XT PNG TIFF TIFF/EP TIFF/IT Others APNG BPG DjVu EXR FLIF ICER MNG PGF QTVR WBMP WebP Containers ISO/IEC MPEG-ES MPEG-PES MPEG-PS MPEG-TS ISO base media file format MPEG-4 Part 14 (MP4) Motion JPEG 2000 MPEG-21 Part 9 MPEG media transport ITU-T H.222.0 T.802 IETF RTP Others 3GP and 3G2 AMV ASF AIFF AVI AU BPG Bink Smacker BMP DivX Media Format EVO Flash Video GXF IFF M2TS Matroska WebM MXF Ogg QuickTime File Format RatDVD RealMedia RIFF WAV MOD and TOD VOB, IFO and BUP Collaborations NETVC MPEG-LA See Compression methods for methods and Compression software for codecs v t e Data compression software Archivers with compression (comparison) Free software 7-Zip Archive Manager Ark Expander FreeArc Info-ZIP KGB Archiver PAQ PeaZip The Unarchiver (decompression only) tar Xarchiver Zipeg ZPAQ Freeware Filzip LHA StuffIt Expander (decompression only) TUGZip ZipGenius Commercial ARC ALZip Archive Utility ARJ BetterZip JAR MacBinary PKZIP/SecureZIP PowerArchiver StuffIt WinAce WinRAR WinZip Non-archiving compressors Generic bzip2 compress gzip lzip lzop pack rzip Snappy XZ Utils For code UPX Audio compression (comparison) Lossy Fraunhofer FDK AAC Nero AAC Codec Freeware Advanced Audio Coder (FAAC) Helix DNA Producer l3enc LAME TooLAME libavcodec libcelt libopus libspeex Musepack libvorbis Windows Media Encoder Lossless ALAC FLAC libavcodec Monkey's Audio mp4als OptimFROG Shorten TTA (True Audio) WavPack Video compression (comparison) Lossy MPEG-4 ASP 3ivx DivX Nero Digital FFmpeg HDX4 Xvid H.264 / MPEG-4 AVC CoreAVC Blu-code DivX FFmpeg Nero Digital OpenH264 QuickTime x264 HEVC DivX x265 Others CineForm Cinepak Daala DNxHD Helix DNA Producer Indeo libavcodec Schrödinger (Dirac) SBC Sorenson VP7 libtheora libvpx Windows Media Encoder Lossless FFV1 Huffyuv Lagarith MSU Lossless YULS See also: compression methods and compression formats Retrieved from "" Categories: Video codecsMicrosoft Windows multimedia technologyDigital rights management systemsHidden categories: All articles with unsourced statementsArticles with unsourced statements from July 2009

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