---
title: "POST robots.v1.job.generate_chapters.errored"
method: POST
path: "robots.v1.job.generate_chapters.errored"
---

# POST robots.v1.job.generate_chapters.errored

`POST robots.v1.job.generate_chapters.errored` (webhook)

## Payload

- object
  - `type` 'robots.v1.job.generate_chapters.errored', 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` 'generate-chapters', required
    - `parameters` object, required
      - `asset_id` string, required: The Mux asset ID of the video to generate chapters for.
      - `language_code` string: BCP 47 language code of the caption source. An explicit language must match a ready source exactly, including case; for example, en does not match en-US. Translation target exclusion and track replacement instead compare base languages case-insensitively. When omitted, automatic selection applies. Uses the first ready subtitle in asset track order without English preference. Audio-only assets with one ready text track lacking subtitle metadata can use that legacy transcript.
      - `output_language_code` string: BCP 47 language code for the output chapter titles. Auto-detected from the transcript if omitted.
      - `output_steering` object: Curated output_steering controls for chapter style, granularity, audience, and brand terminology. These controls guide model behavior but do not guarantee exact output.
        - `chapter_style` 'descriptive' | 'punchy' | 'educational' | 'seo' | 'platform_neutral': Best-effort style guidance for generated chapter titles.
        - `chapter_granularity` 'coarse' | 'balanced' | 'fine': Best-effort guidance for how coarse or fine chapter boundaries should be.
        - `audience` string: Intended audience used as best-effort model guidance. Does not change the output schema.
        - `brand_terms` string[]: Preferred brand or domain terms to use when supported by the source content.
      - `update_asset_chapters` boolean: When true, the generated chapters are written back to the Mux asset as a chapters text track once the job completes, making them deliverable with the asset. Overwrites existing chapters: an asset holds a single chapters track, so any chapters track already on the asset is deleted and replaced — including one in a different language, and one you created yourself. Best-effort — a failed write does not fail the job — so check `asset_updates.chapters` in the job outputs for the outcome.
    - `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.
      - `chapters` object[], required: Generated chapters, ordered by start time.
        - `start_time` number, required: Chapter start time in seconds. The first chapter always starts at 0.
        - `title` string, required: Concise chapter title.
      - `asset_updates` object: Recorded best-effort chapters track update outcome. A failed update does not fail the analysis job. Omitted when no outcome was recorded.
        - `chapters` object: What happened when the generated chapters were written back to the Mux asset. Present only when update_asset_chapters was true. When status is `failed` and replaced_track_ids is nonempty, deletion succeeded but replacement creation failed, leaving the asset without a chapters track.
          - `status` 'created' | 'failed', required: Outcome of the chapters track write. `created` means the asset now carries these chapters. `failed` means the write was attempted and errored; the chapters in this response are still valid and can be applied manually.
          - `track_id` string: Mux text track ID of the chapters track created on the asset. Present when status is `created`.
          - `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)