ASF

File Format
Name	ASF
Ontology	Electronic File Formats Audio and Music ASF
Extension(s)	.asf
MIME Type(s)	video/x-ms-asf, application/vnd.ms-asf
LoCFDD	fdd000067
PRONOM	fmt/131

ASF (Advanced Systems Format, or Advanced Streaming Format) is a multimedia container format associated with Microsoft. It is the container format usually used by media encoded by the WMA and WMV series of codecs.

Identification

ASF files begin with bytes 30 26 b2 75 8e 66 cf 11 a6 d9 00 aa 00 62 ce 6c.

This represents the GUID 75B22630-668E-11CF-A6D9-00AA0062CE6C, named "ASF_Header_Object".

Specifications

• Internet Draft, 1998-02-26
• v1.0, 1998-02-26
  • PDF
• v01.20.03, 2004-12
  • DOC
  • HTML, from archive.org
  • HTML
• v01.20.04, 2010-06
  • PDF
• v01.20.06, 2012-01
  • XPS, from archive.org
  • (PDF used to be available at [1])

Software

• Konvertor
• VLC

Sample files

• http://samples.libav.org/asf-wmv/

Links

• MultimediaWiki article
• Wikipedia article
• MSDN: Overview of the ASF Format