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DFF at a glance
DFF
DFF belongs to the Super Audio CD era, when DSD production chains needed a dedicated interchange wrapper distinct from mainstream PCM-oriented studio formats.
AU at a glance
AU
AU belongs to an earlier multimedia era where workstation and Unix vendors often had their own practical audio defaults.
Format comparison
| Feature | DFF | AU |
|---|---|---|
| File type | Audio | Audio |
| Extensions |
|
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| MIME type |
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| Created year | 2000 | 1987 |
| Inventor | Philips and Sony | Sun Microsystems |
| Status | active | active |
| Primary use cases |
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| Multitrack support | Not supported | Not supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Not supported |
When to use each format
When to use DFF
- Your source file is already in DFF.
- Preserve source expectations before exporting to AU.
- DFF is commonly used in audio workflows.
When to use AU
- Your target workflow expects AU.
- Improve delivery compatibility with AU.
- AU is commonly used in audio workflows.
FAQs
Why convert DFF to AU?
Convert to AU when preserving compatibility with older Unix or workstation software, educational assets, or historical multimedia archives.
In most present-day workflows the practical task is to decode AU content and move it to WAV, AIFF, or a modern compressed format.
Use AU only when downstream compatibility makes it necessary.
What changes when converting DFF to AU?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting DFF to AU?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.