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Windows Media Audio File with WMA9 Codec
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Format Description Properties
• ID: fdd000097
• Short name: WMA_WMA9
• Content categories: sound
• Format category: file format, bitstream encoding
• Last significant update: 2004-05-13
Identification and description 
| Full name | Windows Media Audio File with Windows Media 9 Codec |
| Description | File format based in ASF (Advanced Systems Format) that wraps a Windows Media 9 audio bitstream. |
| Production phase | Generally a final-state format for end-user delivery. |
| Relationship to other formats | |
| Subtype of | WMA (Windows Media Audio) |
| Contains | WMA9 audio codec |
Local use
| LC experience or existing holdings | |
| LC preference | See WMA |
Sustainability factors
| Disclosure | See WMA and ASF |
| Documentation | See WMA and ASF |
| Adoption | Not known to the compilers of this document; the WMA file format is widely adopted. |
| Licensing and patent claims | See ASF for link to pages covering licensing of Windows Media and the Advanced Systems Format. |
| Transparency | Depends upon algorithms and tools to read; will require sophistication to build tools. |
| Self-documentation | See ASF |
| External dependencies | See WMA |
| Technical protection considerations | See ASF |
Quality and functionality factors (video)
| Normal rendering | Good support. |
| Fidelity (support for high audio resolution) | See WMA9 (audio codec). |
| Support for multiple sound channels | See WMA9 (audio codec). |
| Functionality beyond normal rendering | None |
File type signifiers
| Tag type | Value | Note |
| Filename Extension | wma | |
| Internet Media Type | See WMA | |
| Magic numbers | See WMA | |
| ASF GUID | See WMA |
|
Notes
Format specifications
URLs
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Useful references
URLs
See WMA
Print
Last Updated: 03/ 7/2007
