ASF

File Format
Name	ASF
Ontology	Electronic File Formats Audio and Music ASF
Extension(s)	.asf (generic)
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.

Related formats

• WMA
• WMV
• DVR-MS
• ASX

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