---
title: "POST robots.v1.job.translate_captions.completed"
method: POST
path: "robots.v1.job.translate_captions.completed"
---

# POST robots.v1.job.translate_captions.completed

`POST robots.v1.job.translate_captions.completed` (webhook)

## Payload

- object
  - `type` 'robots.v1.job.translate_captions.completed', required: Type for the webhook event
  - `id` string, required: Unique identifier for the event
  - `created_at` string, date-time, required: Time the event was created
  - `object` object, required
    - `type` string, required
    - `id` string, required
  - `environment` object, required
    - `name` string, required: Name for the environment
    - `id` string, required: Unique identifier for the environment
  - `attempts` object[], required: Attempts for sending out the webhook event
    - `webhook_id` integer: Unique identifier for the webhook
    - `response_status_code` integer: HTTP response status code for the webhook attempt
    - `response_headers` object: HTTP response headers for the webhook attempt
    - `response_body` string, nullable: HTTP response body for the webhook attempt
    - `max_attempts` integer: Max attempts number for the webhook attempt
    - `id` string: Unique identifier for the webhook attempt
    - `created_at` string, date-time: Time the webhook request was attempted
    - `address` string: URL address for the webhook attempt
  - `data` object, required: Version 1 job delivered in the Mux webhook event data field. The event type identifies its workflow and transition.
    - `id` string, required: Unique job identifier.
    - `passthrough` string: Arbitrary string supplied at creation, returned as-is.
    - `units_consumed` integer, required: Number of Mux AI units consumed by this job.
    - `directive` object: The directive run that dispatched this job. Absent for jobs created via direct API POST.
      - `id` string, required: ID of the directive that dispatched this job.
      - `run_id` string, required: ID of the specific directive run that dispatched this job.
    - `created_at` integer, required: Unix timestamp (seconds) when the job was created.
    - `updated_at` integer, required: Unix timestamp (seconds) of the job's last state transition (e.g. when it started processing or reached a terminal state).
    - `workflow` 'translate-captions', required
    - `parameters` object, required
      - `asset_id` string, required: The Mux asset ID of the video whose captions will be translated.
      - `track_id` string, required: Mux text track ID of the source captions. Must identify a ready subtitle track, or the single ready legacy text transcript without subtitle metadata on an audio-only asset. A missing or unready source is rejected.
      - `track_name` string: Name for the translated Mux text track. Defaults to "{Language} (Auto-translated)", e.g. "Spanish (Auto-translated)". Mux requires text track names to be unique on an asset, and an existing track with this name is handled according to `replace_existing_tracks`.
      - `upload_to_mux` boolean: Whether to upload the translated VTT and attach it as a text track on the Mux asset. Defaults to true.
      - `never_translate` string[]: Best-effort list of terms (brand names, proper nouns) to preserve verbatim in the translated captions. Does not guarantee exact output. Terms must not contain '<' or '>', invisible characters, or characters altered by Unicode normalization.
      - `replace_existing_tracks` 'fail' | 'replace_all' | 'replace_generated': What to do when the asset already has a text track in the same language as, or with the same name as, the translated track. Defaults to `fail`, which rejects the request before any translation is billed. `replace_all` deletes every such track first. `replace_generated` deletes only Mux Video auto-generated tracks and rejects if an uploaded track is in the way. Any value other than `fail` requires `upload_to_mux` to be true. Existing tracks are matched by language ignoring region subtags, and by name ignoring case, in any status.
      - `output_language_code` string, required: BCP 47 language code for the translated output (e.g. "es", "ja"). Unless replace_existing_tracks allows replacement, the asset must not already have a text track for this language.
    - `status` 'pending' | 'processing' | 'completed' | 'errored' | 'cancelled', required: Current job status.
    - `errors` object[]: Error details. Present when status is 'errored'.
      - `type` string, required: Stable public error category identifier.
      - `message` string, required: Human-readable public error message.
      - `retryable` boolean: Whether retrying this job may resolve the error.
    - `resources` object: Related Mux resources linked to this job.
      - `assets` object[], required: Mux assets associated with this job.
        - `id` string, required: Mux asset ID.
        - `meta` object: Mux asset metadata, if available.
          - `title` string: Asset title from Mux metadata.
          - `creator_id` string: Creator identifier from Mux metadata.
          - `external_id` string: External identifier from Mux metadata.
        - `passthrough` string: Passthrough string from the Mux asset.
        - `_links` object, required: Hypermedia links for the asset.
          - `self` object, required
            - `href` string, required: URL to the Mux asset resource.
    - `outputs` object: Workflow results. Present when status is completed.
      - `temporary_vtt_url` string: Temporary pre-signed URL to download the translated VTT file, including when upload_to_mux is false. Expires 7 days after the job completes.
      - `never_translate_terms_preserved` boolean: Present when never_translate terms were supplied. False when at least one term was not preserved verbatim in the translated captions. Preservation is best-effort: verified, not guaranteed.
      - `track_id` string: Mux text track ID of the newly created translated captions, distinct from the source parameters.track_id. Present when upload_to_mux is true.
      - `replaced_track_ids` string[]: IDs of tracks deleted during replacement. Omitted when no deletions were recorded; historical jobs may lack this information.

## Acknowledgement `200`

Return a 200 to indicate that the data was received successfully

---

[API](https://skmtc.dev/muxinc/apis/mux-api.md) - [All operations](https://skmtc.dev/muxinc/apis/mux-api/llms.txt) - [OpenAPI document](https://skmtc.dev/muxinc/apis/mux-api/revisions/75b4251a1d96?raw)