Guide · Dolby Atmos
ADM BWF: agree the right Atmos delivery
What the master file contains and what to agree with the recipient before delivering the mix.
What is ADM BWF?
ADM BWF is a WAV-based master file that can contain the audio and metadata for a Dolby Atmos mix. The metadata includes spatial positioning. It is different from exporting an ordinary stereo WAV.
Start with the recipient’s requirements
Ask the distributor, broadcaster or post facility for the current delivery specification. ADM BWF may be part of an Atmos delivery, but it is not by itself a complete cinema or streaming package. Agree the additional files and quality checks separately.
Checklist before export
- Recipient, platform and exact version of the delivery specification.
- Picture version, frame rate, start timecode and duration.
- Required master format, sample rate and other technical settings.
- Agreed language versions, stems and any M&E.
- Requirements for loudness, peaks, file names and QC documentation.
- Who approves the mix and delivery.
An example delivery list
| File | Purpose |
|---|---|
| ADM BWF | Atmos master, if the recipient requires this format. |
| DX / FX / MX | Separate groups of dialogue, effects and music as agreed. |
| Stereo | A checked stereo version for the agreed purpose. |
| QC / README | Version details, file inventory and agreed check results. |
The list is a starting point for discussion. The actual masters, stems and measurement targets follow the project agreement and the recipient’s specification.
Check the actual export
Reopen the master in a compatible tool. Check content, synchronisation, metadata and measurements. Also listen to the agreed stereo or binaural versions so perspective and balance work where the audience will hear them.
Tell me about your project
Send a short brief and, if you have one, a link to a script, cut or references. I typically respond within 48 hours on business days.