Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | RealAudio, Version 10, RealAudio Codec |
| Description | Recommended by RealMedia for use when delivered bitrates are 128 kb/s or less, for lower bandwidth streaming. |
| Production phase | Generally a final-state (end-user delivery) format. |
| Relationship to other formats | |
| Subtype of | RealAudio_10 |
| Contains | RealAudio codec, not separately documented |
| LC experience or existing holdings | RealAudio, including versions earlier than 10 and using the RealAudio codec, is used as streaming format for most audio presented in American Memory, with a target data rate oriented to users with dial-up modems. |
| LC preference | Considerations of quality and sustainability mean that WAVE_LPCM is preferred over RealAudio; considerations of sustainability mean that MP3 is preferred. |
| Disclosure | See RealAudio_10 |
| Documentation | See RealAudio_10 |
| Adoption | See RealAudio_10 |
| Licensing and patent claims | See RealAudio_10 |
| Transparency | See RealAudio_10 |
| Self-documentation | See RealAudio_10 |
| External dependencies | See RealAudio_10 |
| Technical protection considerations | See RealAudio_10 |
| Normal rendering | Good support. |
| Fidelity (support for high audio resolution) | Moderate; promotional literature says that this codec is "renowned for delivering near CD quality at 64 kbps." |
| Support for multiple channels | See RealAudio_10 |
| Support for downloadable or user-defined sounds, samples, and patches | Not applicable |
| Functionality beyond normal video rendering | See RealAudio_10 |
| Tag type | Value | Note |
| Filename Extension | ra | Note that streaming applications require an associated ram (RealMedia Metafile) file. |
| Internet Media Type | See RealAudio_10 | |
| Magic numbers | See RealAudio_10 |
| General | |
| History |
URLs
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URLs
• See RealAudio_10
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