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AU at a glance
AU
AU belongs to an earlier multimedia era where workstation and Unix vendors often had their own practical audio defaults.
RealMedia at a glance
RealMedia
RM comes from the same proprietary streaming-media period as RealAudio and RealVideo, when end-to-end delivery systems often revolved around a branded container, player, and server stack.
Format comparison
| Feature | AU | RealMedia |
|---|---|---|
| File type | Audio | Audio |
| Extensions |
|
|
| MIME type |
|
|
| Compression / quality | depends | depends |
| File size characteristics | medium | medium |
| Compatibility | broad | broad |
| Editability | limited | limited |
| Created year | 1987 | 1997 |
| Inventor | Sun Microsystems | RealNetworks |
| Status | active | legacy |
| Primary use cases |
|
|
| Common software |
|
|
| Archival suitability | moderate | moderate |
| Metadata handling | moderate | moderate |
| Delivery profile | strong | strong |
| Workflow fit | delivery | delivery |
| Multitrack support | Not supported | Not supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Supported |
When to use each format
When to use AU
- capture ingest
- editing and mastering
- streaming or playback delivery
- Historically important in Unix/workstation audio.
When to use RealMedia
- capture ingest
- editing and mastering
- streaming or playback delivery
- Important as a historical container in early web streaming.
FAQs
Why convert AU to RealMedia?
Choose RealMedia as target when convert to or from RealMedia when recovering early streaming archives, preserving old RealPlayer distributions, or migrating low-bandwidth internet-era audio and multimedia collections into current formats.
What changes when converting AU to RealMedia?
Convert to or from RealMedia when recovering early streaming archives, preserving old RealPlayer distributions, or migrating low-bandwidth internet-era audio and multimedia collections into current formats. It is primarily valuable for legacy web-media access and archival cleanup rather than new publishing.
What should I review after converting AU to RealMedia?
After conversion, review these destination checks: Open converted output in RealPlayer lineage and verify behavior on real samples; Compare output against the expected depends quality profile; Container identity can blur audio and video expectations.
How can I keep quality stable in AU to RealMedia conversion?
Run representative samples, keep settings deterministic, and monitor these risks: Proprietary legacy format with limited present-day workflow value outside migration; Container identity can blur audio and video expectations; Validate destination compatibility before large-batch conversion.