Dubbing

Dubbing Projects API Reference

Full endpoint-by-endpoint reference for the Dubbing Projects API.

• Base URL: https://api.elevenlabs.io

• Authentication: xi-api-key header on every request (the SDKs read ELEVENLABS_API_KEY)

• SDK: elevenlabs.dubbing.project.* in Python and JavaScript (camelCase methods in JS). The older client.dubbing.* methods are the legacy v1 API — do not use them

• Model: dubbing_v2 (default)

• Source size limit: up to 3 GiB per source (upload or URL)

• Enterprise: transcript editing and regeneration endpoints are available to enterprise workspaces only

Contents

• Endpoint quick reference

• Projects

• Source transcript

• Languages

• Language transcript (translations)

• Regeneration

• Revisions

Endpoint quick reference

JS methods are the same paths in camelCase (e.g. dubbing.project.transcript.updateSegment).

Projects

Create a project

POST /v1/dubbing/project — multipart/form-data with either file or source_url (not both).

Auto-detected source language: if source_language is omitted, the project's source_language stays null; the detected language is reported as the language field on the source transcript.

Response (201 Created) — the project starts in queued; media is null until preparation finishes:

{
  "project_id": "proj_1601kwkyxp0hfzvtmyxwqxx6mcy3",
  "status": "queued",
  "reference": "Q3 marketing video",
  "source_language": "en",
  "model_id": "dubbing_v2",
  "media": null,
  "language_ids": [],
  "revision": 0,
  "created_at": "2026-07-03T10:15:30Z",
  "updated_at": "2026-07-03T10:15:30Z"
}

The source is fetched (for a URL) and transcribed asynchronously — poll the project until it reaches ready.

Get a project

GET /v1/dubbing/project/{project_id}

Once ready, media is populated:

{
  "project_id": "proj_1601kwkyxp0hfzvtmyxwqxx6mcy3",
  "status": "ready",
  "reference": "Q3 marketing video",
  "source_language": "en",
  "model_id": "dubbing_v2",
  "media": {
    "filename": "promo.mp4",
    "duration_s": 42.5,
    "has_video": true,
    "mime_type": "video/mp4"
  },
  "language_ids": [],
  "revision": 0,
  "created_at": "2026-07-03T10:15:30Z",
  "updated_at": "2026-07-03T10:17:12Z"
}

language_ids stays empty until languages are added; revision stays 0 until the source transcript is edited (transcription itself doesn't bump it).

Project states:

List projects

GET /v1/dubbing/project — cursor-paginated.

Query params: page_size (default 20, max 100), cursor, status (queued/preparing/ready/failed), sort_direction (DESCENDING default).

{ "projects": [ /* ProjectResponse... */ ], "next_cursor": null }

Pass next_cursor back as cursor to fetch the next page; null means the end.

Delete a project

DELETE /v1/dubbing/project/{project_id} — deletes the project and its languages.

Source transcript

Transcript editing (and regeneration) is available to enterprise workspaces only. Every source edit bumps the project's revision; each edit response returns the new value. Editing the source after a language exists marks that language's output stale and requires a regeneration — finalize the source before adding languages.

Get the source transcript

GET /v1/dubbing/project/{project_id}/transcript

{
  "language": "en",
  "segments": [
    {
      "id": "0199a3f0-1c2d-7abc-8def-0123456789ab",
      "text": "Welcome to our product demo.",
      "speaker_id": "default_speaker",
      "start_s": 0.0,
      "end_s": 2.5
    }
  ],
  "revision": 0
}

Each segment has a stable id used to edit or delete it.

Edit a segment

PATCH /v1/dubbing/project/{project_id}/transcript/segment/{segment_id}

Send only the fields to change (text, speaker_id, start_s, end_s); at least one is required. If sending both start_s and end_s, end_s must be greater than start_s.

{
  "segment": {
    "id": "0199a3f0-1c2d-7abc-8def-0123456789ab",
    "text": "Welcome to our latest product demo.",
    "speaker_id": "default_speaker",
    "start_s": 0.0,
    "end_s": 2.5
  },
  "revision": 1
}

Add a segment

POST /v1/dubbing/project/{project_id}/transcript/segment

All fields required (text, speaker_id, start_s, end_s). The server assigns the segment id. Use a speaker_id that already appears in the source transcript so the new line is dubbed with that speaker's voice.

The response echoes the new segment with its server-assigned id plus the new project revision.

Delete a segment

DELETE /v1/dubbing/project/{project_id}/transcript/segment/{segment_id}

{ "revision": 3 }

Languages

Add a language

POST /v1/dubbing/project/{project_id}/language

JSON body:

Response (201 Created) — starts queued:

{
  "language_id": "lang_1001kwkyxp0je6ktn4knsfrasx5s",
  "project_id": "proj_1601kwkyxp0hfzvtmyxwqxx6mcy3",
  "target_language": "es",
  "status": "queued",
  "model_id": "dubbing_v2",
  "outputs": null,
  "revision": 0,
  "output_revision": null,
  "created_at": "2026-07-03T10:16:00Z",
  "updated_at": "2026-07-03T10:16:00Z"
}

A language can be added to a project that isn't ready yet — it stays queued and starts automatically once the project becomes ready. You can also queue the first language when creating the project by passing target_language to project.create.

Language states:

Get a language

GET /v1/dubbing/project/{project_id}/language/{language_id}

Once completed, outputs carries signed, time-limited download URLs (valid ~1 hour; re-fetch the language for a fresh URL): lossless_audio for the dubbed audio and subtitles for the translated lines as WebVTT subtitles timed to the source speech (null when none are available):

{
  "language_id": "lang_1001kwkyxp0je6ktn4knsfrasx5s",
  "project_id": "proj_1601kwkyxp0hfzvtmyxwqxx6mcy3",
  "target_language": "es",
  "status": "completed",
  "model_id": "dubbing_v2",
  "outputs": {
    "lossless_audio": "https://storage.googleapis.com/eleven-dubbing/.../output.wav?X-Goog-Signature=...",
    "subtitles": "<signed WebVTT URL>"
  },
  "revision": 0,
  "output_revision": 0,
  "created_at": "2026-07-03T10:16:00Z",
  "updated_at": "2026-07-03T10:20:45Z"
}

When output_revision equals revision, the downloadable output reflects the current transcript. When it's behind (and status is stale), the output is out of date and needs a regeneration.

List languages

GET /v1/dubbing/project/{project_id}/language — cursor-paginated, optional status filter.

Delete a language

DELETE /v1/dubbing/project/{project_id}/language/{language_id} → 204 No Content.

Language transcript (translations)

Get a language's transcript

GET /v1/dubbing/project/{project_id}/language/{language_id}/transcript

Pairs each source segment with its translation (null = not yet translated). Segment ids match the source transcript, so translations line up against the source.

{
  "source_language": "en",
  "target_language": "es",
  "segments": [
    {
      "id": "0199a3f0-1c2d-7abc-8def-0123456789ab",
      "speaker_id": "default_speaker",
      "start_s": 0.0,
      "end_s": 2.5,
      "source_text": "Welcome to our latest product demo.",
      "translation": "Bienvenido a la demostración de nuestro producto."
    }
  ],
  "revision": 0
}

Edit a translation

PATCH /v1/dubbing/project/{project_id}/language/{language_id}/transcript/segment/{segment_id}

Body: {"translation": "..."}. Pass null to clear it and mark the segment for re-translation.

A translation edit affects only this language — the source transcript and other languages are untouched. It bumps this language's revision, and a completed language becomes stale: its downloadable output still reflects the previous output_revision until regenerated.

Regeneration

POST /v1/dubbing/project/{project_id}/language/{language_id}/transcript/regenerate

Produces a fresh dub from the current transcript after editing a language's translation (or after source edits marked it stale). Charged like a generation.

Response (202 Accepted) — the language goes back to queued; output_revision still points at the previous output until the new one finishes:

{
  "language_id": "lang_1001kwkyxp0je6ktn4knsfrasx5s",
  "project_id": "proj_1601kwkyxp0hfzvtmyxwqxx6mcy3",
  "target_language": "es",
  "status": "queued",
  "model_id": "dubbing_v2",
  "outputs": null,
  "revision": 1,
  "output_revision": 0,
  "created_at": "2026-07-03T10:16:00Z",
  "updated_at": "2026-07-03T10:25:10Z"
}

Poll the language until completed, then download the refreshed outputs.lossless_audio. At that point output_revision equals revision.

Returns 409 Conflict if the project isn't ready or the language isn't in a settled state (e.g. it's already generating).

Revisions

Every project and language carries its own monotonic revision counter, each starting at 0 and independent of the others:

• The project's revision increases on each source-transcript edit (transcription itself doesn't bump it).

• A language's revision starts at 0 when the language is created — it does not inherit the project's current revision — and increases when its translation is edited or when a source edit affects it.

• A language's output_revision is the revision its current audio was generated from. When output_revision is behind revision, the output is out of date and needs a regeneration.