# PATCH /v1/dubbing/resource/{dubbing_id}/segment/{segment_id}/{language} (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Modify A Single Segment

## Critical Gotchas
* Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.
* Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (`--output speech.mp3`) rather than parsing it.

## cURL
curl -X PATCH 'https://api.elevenlabs.io/v1/dubbing/resource/dubbing-id/segment/segment-id/example-language' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"start_time":0,"end_time":0,"text":"string"}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| dubbing_id | path | string | Yes | ID of the dubbing project. |
| segment_id | path | string | Yes | ID of the segment |
| language | path | string | Yes | ID of the language. |
| start_time | body | number | No | Request body field start_time. |

## Response (200 OK)
{"version":0}

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