Advanced Systems Format
File format / From Wikipedia, the free encyclopedia
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".wmv", "WMV file", ".wma", and "WMA file" redirect here. For the video codec, see Windows Media Video. For the audio codec, see Windows Media Audio.
Advanced Systems Format (formerly Advanced Streaming Format, Active Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Media Foundation framework.
Quick Facts Filename extension, Internet media type ...
Filename extension |
.asf .wma .wmv |
---|---|
Internet media type |
video/x-ms-asf, application/vnd.ms-asf[1] |
Type code | 'ASF_' |
Uniform Type Identifier (UTI) | com.microsoft.advanced-systems-format |
Magic number | 30 26 B2 75 8E 66 CF 11 A6 D9 00 AA 00 62 CE 6C[2] |
Developed by | Microsoft |
Initial release | Proprietary: 16 September 1996; 27 years ago (1996-09-16)[3][4] Public: 26 February 1998; 26 years ago (1998-02-26)[5] |
Latest release | 01.20.03 December 2004; 19 years ago (2004-12) |
Type of format | Container format |
Container for | Windows Media Audio, Windows Media Video, VC-1 |
Open format? | Yes |
Free format? | No[6] |
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