How to dub a film into another language on a Mac

To dub a film into another language on a Mac with cinemaOS, open HOME (⌘⇧H) and pick the Dub tile ("Another language"). It takes you to Finisher ▸ Localize ▸ Dub. Set the spoken and target languages, transcribe, review the speakers, choose Quick Voice-over or Production Dub, run preflight, and render. The result is a new deliverable with a loudness report beside it. Everything runs on your Mac.

Before you plan a release around it, know the limits. cinemaOS does not do lip sync. Mouths on screen will not move to the new language. The voices come from macOS, so their quality depends on which voices you install. Optional voice cloning exists, but only after a voice-rights attestation, and it carries timbre only, not performance. Used with those limits in mind, a local dub is a practical way to make a film watchable for an audience that does not read subtitles.

When a local dub makes sense

Dubbing is not always the right answer. Subtitles are cheaper, keep the original performance and are expected at festivals. Dubs help when:

• the audience includes children, or viewers who find subtitles hard to follow;
• the film is documentary, educational or corporate, where a voice-over style is accepted;
• you need a review or pitch version in another language quickly;
• you want a temp track for a distributor before commissioning human dubbing.

For drama with close-up performance, a professional dub with actors and a director is still the standard. A synthetic dub can be the reference that helps you brief that work.

Prepare your Mac: install better voices

The dub can only sound as good as the installed macOS voice. Default compact voices are fine for testing and noticeably flat for anything you will show.

1. Open System Settings ▸ Accessibility ▸ Spoken Content.
2. Next to System voice, choose Manage Voices….
3. For each target language, download the Enhanced or Premium voices where they are offered.
4. If a new voice does not show up, quit and reopen cinemaOS. In the Dub panel, More languages on this Mac shows what is available.

These downloads are large. Keep disk space in mind; cinemaOS itself recommends 40 GB free.

Step by step in Localize ▸ Dub

1. Set the languages

Choose the Spoken language of the original, then one or more Target languages. Translation runs locally on the same model used for subtitles, with the same honest quality tiers. Dutch, French, German and Portuguese (Portugal) are rated Good. Other languages are Draft or Rough and need a fluent reviewer before delivery. For a first project, start with a Good-tier language.

2. Transcribe and correct the script

Transcribe locally, then read the transcript against the picture. Fix names, numbers and misheard words. A dub reads the translated script aloud, so every error is spoken, which is harder to ignore than a typo in a subtitle. The same correction habits apply as in our guide to translating subtitles locally.

3. Review the speakers

cinemaOS detects up to four speakers. Check every assignment, since a line given to the wrong speaker will be voiced by the wrong voice. Merge duplicates, split overlaps, and label anyone beyond four by hand. Then pick a voice for each speaker from the installed macOS voices.

4. Voice cloning only with consent

If you want a dubbed line to carry something of the original speaker's timbre, cinemaOS can clone a voice with OpenVoice V2. It will not start until you complete the voice-rights attestation: you confirm you have the right to use that person's voice. After that, you enroll and audition each speaker.

Be clear with yourself and your audience about what this does. It transfers timbre only. Acting, emotion and timing do not transfer. Use Set Disclosure… to record how you will tell the audience the voice is synthetic. cinemaOS writes a provenance sidecar, a SHA-256 record of how the audio was made. It is a record, not a watermark.

If you do not have clear written consent, use a stock macOS voice instead.

5. Choose Quick Voice-over or Production Dub

• Quick Voice-over is the faster path, good for review copies, internal versions and voice-over style documentary work.
• Production Dub is the fuller path for a version you intend to deliver.

If you are unsure, render a Quick Voice-over of one scene first and judge it with fresh ears.

6. Run preflight, then dub

Preflight checks the job before it runs. Fix what it flags. When you start a batch across several languages, it is all-or-none: if one language fails, none are written, so you never end up with a half-finished set by mistake. The result is written as a new deliverable. Your original sequence is not changed.

Check the mix and the loudness report

A dub sits on top of music and effects. Easy Mix gives you a quick dub balance. For finer control, open the SOUND console (⌘⌥S) to ride levels, use sends and automation, or add processing.

Then read the loudness and true-peak report. Delivery loudness preflight follows BS.1770-4, so you can check the dub against the target your platform or broadcaster sets. If you need a primer on targets, read loudness standards for delivery.

What to expect, honestly

• No lip sync. On close-ups, the mismatch is visible. Wider shots, narration and documentary work hide it better.
• Voices are only as good as macOS. Enhanced and Premium voices make a large difference. Compact voices sound robotic in long passages.
• Translation needs review outside the Good tier.
• Cloning is timbre only, rights-gated and recorded in the sidecar.
• Nothing is uploaded. No project, media, transcript or prompt leaves the Mac for AI.

FAQ

Can cinemaOS make the actors' lips match the new language?

No. cinemaOS does not do lip sync. Choose shots and styles where that matters less, or commission a professional dub.

Do I need an internet connection to dub?

No. Transcription, translation and voice rendering run on the Mac. The network is only used for account, licence and updates.

Can I clone anyone's voice from the footage?

Only after completing the voice-rights attestation, which confirms you have the right to use that voice. Without consent, use a stock macOS voice.

Try a dub of one scene

Pick a two-minute scene, install an Enhanced voice for French or German, and run it through Localize ▸ Dub. Download cinemaOS and try it during the 60-day free trial; no card is required.