Contents 1 Overview and features 2 License 3 See also 4 References 5 External links

Overview and features[edit] ASF is based on serialized objects which are essentially byte sequences identified by a GUID marker. The format does not specify how (i.e. with which codec) the video or audio should be encoded; it just specifies the structure of the video/audio stream. This is similar to the function performed by the QuickTime, AVI, or Ogg container formats. One of the objectives of ASF was to support playback from digital media servers, HTTP servers, and local storage devices such as hard disk drives. The most common media contained within an ASF file are Windows Media Audio (WMA) and Windows Media Video (WMV). The most common file extensions for ASF files are extension .WMA (audio-only files using Windows Media Audio, with MIME-type audio/x-ms-wma) and .WMV (files containing video, using the Windows Media Audio and Video codecs, with MIME-type video/x-ms-asf). These files are identical to the old .ASF files but for their extension and MIME-type. The different extensions are used to make it easier to identify the content of a media file.[3] ASF files can also contain objects representing metadata, such as the artist, title, album and genre for an audio track, or the director of a video track, much like the ID3 tags of MP3 files. It supports scalable media types and stream prioritization; as such, it is a format optimized for streaming. The ASF container provides the framework for digital rights management in Windows Media Audio and Windows Media Video. An analysis of an older scheme used in WMA reveals that it is 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. ASF container-based media are sometimes still streamed on the internet either through the MMS protocol or the RTSP protocol. Mostly, however, they contain material encoded for 'progressive download', which can be distributed by any webserver and then offers the same advantages as streaming: the file starts playing as soon as a minimum number of bytes is received and the rest of the download continues in the background while one is watching or listening. The Library of Congress Digital Preservation project considers ASF to be the de facto successor of RIFF.[2] In 2010 Google picked RIFF as the container format for WebP.

License[edit] The specification is downloadable from the Microsoft website,[4] and the format can be implemented under a license from Microsoft that however does not allow distribution of sources and is not compatible with open source licenses. The author of the free software project VirtualDub reported that a Microsoft employee informed him that his software violated a Microsoft patent regarding ASF playback.[5] Certain error-correcting techniques related to ASF are patented in the United States (United States Patent 6,041,345 Levi, et al. March 21, 2000) by Microsoft.

See also[edit] Audio Video Interleave (AVI) Advanced Stream Redirector (ASX) Comparison of container formats

References[edit] ^ Microsoft (1997). "Registration of MIME media type application/". IANA.  ^ a b "ASF (Advanced Systems Format)". Digital Preservation. Library of Congress. 2014-02-04. Retrieved 2014-03-12.  ^ The Difference Between ASF and WMV/WMA Files ^ ASF Specification Download ^ Advogato: Microsoft patents ASF media file format, stops reverse engineering

External links[edit] An Overview of Advanced Systems Format Overview of the ASF Format Library of Congress analysis of ASF format sustainability ASF Container Format - v2.0 (free available but unused) and v1.0 (reconstructed) MSDN How To Embed Windows Media Player in a HTML Web Page (For Webmasters) Creating A Windows Media Custom Experience (For Webmasters) 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 Internet Explorer Versions Main 1 2 3 4 5 6 7 8 9 10 11 Other Mobile for Mac for UNIX IEs4Linux Overview History Add-ons Box model Browser Helper Object (BHO) Easter eggs Extensions Removal Shells Technologies Accelerator ActiveX Dynamic HTML HTA HTML Components favicon.ico HTML+TIME Index.dat JScript MHTML MSXML RSS Platform Smart tags Temporary Internet Files Vector Markup Language Web Slice WPAD XHR/XDomainRequest Software & engines Administration Kit Developer Tools Integrated Windows Authentication Tasman Trident Chakra Implementations Active Channel Active Desktop ActiveMovie Channel Definition Format (.cdf) Comic Chat/Chat 2.0 DirectX Media Internet Mail and News Microsoft Java Virtual Machine (MSJVM) MSN Explorer MSN for Mac OS X NetMeeting NetShow Outlook Express Server Gated Cryptography (SGC) Spyglass Windows Address Book Windows Desktop Update Events First browser war Second browser war Download.ject Eolas v. Microsoft Sun v. Microsoft United States v. Microsoft Corp. People Tantek Çelik Thomas Reardon Dean Hachamovitch Scott Isaacs Inori Aizawa Category Commons Microsoft portal Internet portal Retrieved from "" Categories: Internet ExplorerContainer formatsMicrosoft Windows multimedia technologyDigital rights management systems

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