Mux Edit Captions API

openapi: 3.1.0
info:
  title: Mux Animated Images Edit Captions API
  description: Mux is how developers build online video. This API encompasses both Mux Video and Mux Data functionality to help you build your video-related projects better and faster than ever before.
  version: v1
  contact:
    name: Mux DevEx
    url: https://docs.mux.com
    email: devex@mux.com
servers:
- url: https://api.mux.com
  description: Mux Production API
- url: https://image.mux.com
- url: https://stream.mux.com
- url: https://stats.mux.com
tags:
- name: Edit Captions
  description: Edit an existing caption track with find-and-replace edits and optional profanity censoring. This workflow is currently in beta.
  x-displayName: Edit Captions
paths:
  /robots/v0/jobs/edit-captions:
    post:
      operationId: create-edit-captions-job
      summary: Create an 'edit-Captions' Job
      description: Creates a new job that edits an existing Mux text track using static replacements and optional profanity censoring. Provide at least one of `replacements` or `auto_censor_profanity`.
      tags:
      - Edit Captions
      requestBody:
        description: Caption editing parameters
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateEditCaptionsJobRequest'
            example:
              parameters:
                asset_id: mux_asset_123abc
                track_id: text_track_456def
                replacements:
                - find: Mucks
                  replace: Mux
                  case_sensitive: true
                - find: gonna
                  replace: going to
                upload_to_mux: true
                delete_original_track: true
      responses:
        '202':
          description: Caption editing job queued
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EditCaptionsJobResponse'
              example:
                data:
                  id: rjob_example123
                  workflow: edit-captions
                  status: pending
                  units_consumed: 0
                  created_at: 1700000000
                  updated_at: 1700000060
                  parameters:
                    asset_id: mux_asset_123abc
                    track_id: text_track_456def
                    replacements:
                    - find: Mucks
                      replace: Mux
                      case_sensitive: true
                    - find: gonna
                      replace: going to
                    upload_to_mux: true
                    delete_original_track: true
        '400':
          description: Validation error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Missing Mux credentials
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Robots is not enabled for this environment. Accept the Robots beta terms in the Mux Dashboard to enable access.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: Asset not found, no playback ID, or the requested text track is not ready
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      servers:
      - url: https://api.mux.com
      security:
      - accessToken: []
      - authorizationToken: []
  /robots/v0/jobs/edit-captions/{JOB_ID}:
    get:
      operationId: get-edit-captions-job
      summary: Get an 'edit-Captions' Job
      description: Retrieves the current status and results of an 'edit-captions' job.
      tags:
      - Edit Captions
      parameters:
      - schema:
          type: string
          minLength: 1
          maxLength: 255
        required: true
        name: JOB_ID
        in: path
      responses:
        '200':
          description: Current status for the requested job
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EditCaptionsJobResponse'
              example:
                data:
                  id: rjob_example123
                  workflow: edit-captions
                  status: completed
                  units_consumed: 1
                  created_at: 1700000000
                  updated_at: 1700000060
                  parameters:
                    asset_id: mux_asset_123abc
                    track_id: text_track_456def
                    replacements:
                    - find: Mucks
                      replace: Mux
                      case_sensitive: true
                    - find: gonna
                      replace: going to
                    upload_to_mux: true
                    delete_original_track: true
                  outputs:
                    total_replacement_count: 5
                    uploaded_track_id: text_track_789ghi
                    temporary_vtt_url: https://s3.example.com/edited.vtt?sig=abc
        '403':
          description: Robots is not enabled for this environment. Accept the Robots beta terms in the Mux Dashboard to enable access.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: No job exists for the supplied id
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      servers:
      - url: https://api.mux.com
      security:
      - accessToken: []
      - authorizationToken: []
components:
  schemas:
    EditCaptionsJobOutputs:
      type: object
      properties:
        total_replacement_count:
          type: integer
          minimum: 0
          description: Total count of cue text replacements applied across all edit operations.
        uploaded_track_id:
          type: string
          minLength: 1
          description: Mux text track ID for the uploaded edited captions. Present when upload_to_mux is true and the upload succeeds.
        temporary_vtt_url:
          type: string
          minLength: 1
          description: Temporary pre-signed URL for downloading the edited VTT file.
      required:
      - total_replacement_count
      example:
        total_replacement_count: 5
        uploaded_track_id: text_track_789ghi
        temporary_vtt_url: https://s3.example.com/edited.vtt?sig=abc
      description: Workflow results. Present when status is 'completed'.
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            type:
              type: string
              description: Machine-readable error type.
            message:
              type: string
              description: Human-readable error message describing what went wrong.
          required:
          - type
          - message
      required:
      - error
    EditCaptionsJob:
      type: object
      properties:
        id:
          type: string
          description: Unique job identifier.
        passthrough:
          type: string
          description: Arbitrary string supplied at creation, returned as-is.
        units_consumed:
          type: integer
          minimum: 0
          description: Number of Mux AI units consumed by this job.
        created_at:
          type: integer
          minimum: 0
          description: Unix timestamp (seconds) when the job was created.
        updated_at:
          type: integer
          minimum: 0
          description: Unix timestamp (seconds) when the job was last updated.
        workflow:
          type: string
          enum:
          - edit-captions
        parameters:
          $ref: '#/components/schemas/EditCaptionsJobParameters'
        status:
          $ref: '#/components/schemas/JobStatus'
        outputs:
          $ref: '#/components/schemas/EditCaptionsJobOutputs'
        errors:
          type: array
          items:
            $ref: '#/components/schemas/JobError'
          description: Error details. Present when status is 'errored'.
        resources:
          $ref: '#/components/schemas/Resources'
      required:
      - id
      - units_consumed
      - created_at
      - updated_at
      - workflow
      - parameters
      - status
    JobError:
      type: object
      properties:
        type:
          type: string
          description: Stable public error category identifier.
        message:
          type: string
          description: Human-readable public error message.
        retryable:
          type: boolean
          description: Whether retrying this job may resolve the error.
      required:
      - type
      - message
    SlimlineAsset:
      type: object
      properties:
        id:
          type: string
          description: Mux asset ID.
        meta:
          type: object
          properties:
            title:
              type: string
              description: Asset title from Mux metadata.
            creator_id:
              type: string
              description: Creator identifier from Mux metadata.
            external_id:
              type: string
              description: External identifier from Mux metadata.
          description: Mux asset metadata, if available.
        passthrough:
          type: string
          description: Passthrough string from the Mux asset.
        _links:
          type: object
          properties:
            self:
              type: object
              properties:
                href:
                  type: string
                  description: URL to the Mux asset resource.
              required:
              - href
          required:
          - self
          description: Hypermedia links for the asset.
      required:
      - id
      - _links
    CreateEditCaptionsJobRequest:
      type: object
      properties:
        passthrough:
          type: string
          description: Arbitrary string stored with the job and returned in responses. Useful for correlating jobs with your own systems.
        parameters:
          $ref: '#/components/schemas/EditCaptionsJobParameters'
      required:
      - parameters
    EditCaptionsJobResponse:
      type: object
      properties:
        data:
          $ref: '#/components/schemas/EditCaptionsJob'
      required:
      - data
    JobStatus:
      type: string
      enum:
      - pending
      - processing
      - completed
      - errored
      - cancelled
      description: Current job status.
    Resources:
      type: object
      properties:
        assets:
          type: array
          items:
            $ref: '#/components/schemas/SlimlineAsset'
          description: Mux assets associated with this job.
      required:
      - assets
      example:
        assets:
        - id: abc123asset
          meta:
            title: My Video
            creator_id: user123
            external_id: ext456
          _links:
            self:
              href: https://api.mux.com/video/v1/assets/abc123asset
      description: Related Mux resources linked to this job.
    EditCaptionsJobParameters:
      type: object
      properties:
        asset_id:
          type: string
          minLength: 1
          description: The Mux asset ID whose existing text track should be edited.
        track_id:
          type: string
          minLength: 1
          description: The existing ready Mux text track ID to edit and optionally replace.
        auto_censor_profanity:
          type: object
          properties:
            detection_method:
              type: string
              enum:
              - llm
              default: llm
              description: How profanity is detected. Currently only `llm` is supported, which uses an LLM to identify profanity in cue text.
            mode:
              type: string
              enum:
              - blank
              - remove
              - mask
              default: blank
              description: 'Replacement strategy for detected profanity: blank inserts bracketed underscores, remove drops the match, and mask replaces characters with question marks. Defaults to "blank".'
            always_censor:
              type: array
              items:
                type: string
                minLength: 1
              description: Additional words or short phrases that should always be censored even if the model does not detect them.
            never_censor:
              type: array
              items:
                type: string
                minLength: 1
              description: Words or short phrases that should never be censored even if the model flags them.
          description: Optional LLM-driven profanity detection and censorship rules applied to the selected caption track.
        replacements:
          type: array
          items:
            type: object
            properties:
              find:
                type: string
                minLength: 1
                description: Exact word or phrase to replace in cue text.
              replace:
                type: string
                description: Replacement text to insert when a match is found.
              case_sensitive:
                type: boolean
                default: false
                description: When true, `find` is matched only with exact case. Defaults to false (case-insensitive matching), so "gonna" also matches "Gonna" and "GONNA".
            required:
            - find
            - replace
          description: Optional static word or phrase replacements applied directly to cue text.
        upload_to_mux:
          type: boolean
          default: true
          description: Whether to upload the edited VTT back to the Mux asset as a new text track. Defaults to true.
        delete_original_track:
          type: boolean
          default: true
          description: Whether to delete the original source text track after the edited track upload succeeds. Has effect only when upload_to_mux is true. Defaults to true.
        track_name_suffix:
          type: string
          minLength: 1
          description: Optional suffix appended to the uploaded replacement track name. Defaults to "edited".
      required:
      - asset_id
      - track_id
      example:
        asset_id: mux_asset_123abc
        track_id: text_track_456def
        replacements:
        - find: Mucks
          replace: Mux
          case_sensitive: true
        - find: gonna
          replace: going to
        upload_to_mux: true
        delete_original_track: true
  securitySchemes:
    accessToken:
      description: 'The Mux Video API uses an Access Token and Secret Key for authentication. If you haven''t already, [generate a new Access Token](https://dashboard.mux.com/settings/access-tokens) in the Access Token settings of your Mux account dashboard.


        Once you have an Access Token ID and Secret, you can then simply include those as the username (id) and password (secret) in the same way you use traditional basic auth.

        '
      scheme: basic
      type: http
    authorizationToken:
      description: 'OAuth authorization token, used as a Bearer Auth header

        '
      scheme: bearer
      type: http
x-tagGroups:
- name: Video
  tags:
  - Assets
  - Live Streams
  - Playback ID
  - URL Signing Keys
  - Direct Uploads
  - Delivery Usage
  - Playback Restrictions
  - DRM Configurations
  - Transcription Vocabularies
- name: Data
  tags:
  - Video Views
  - Errors
  - Filters
  - Exports
  - Metrics
  - Monitoring
  - Real-Time
  - Dimensions
  - Incidents
  - Annotations
  - View and Viewer Counts
- name: System
  tags:
  - Signing Keys
  - Utilities
- name: Robots
  tags:
  - Jobs
  - Ask Questions
  - Edit Captions
  - Find Key Moments
  - Generate Chapters
  - Moderate
  - Summarize
  - Translate Captions
- name: Playback
  tags:
  - Thumbnails
  - Animated Images
  - Storyboards
  - Streaming
  - Captions and Transcripts