Async File Transcription API

For long files (e.g. 2-hour conference recordings, podcasts, or movie video tracks), use OneASR’s asynchronous task API.

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1. Create Transcription Task (POST /v1/file-transcription/transcriptions)

POST /v1/file-transcription/transcriptions
Authorization: Bearer sk-oneasr-...
Content-Type: multipart/form-data

Form Parameters:

• file: Audio/Video binary object (mp3, wav, mp4, mkv, etc. up to 2GB).
• model: Target ASR model (faster-whisper, qwen, firered).
• language: (Optional) ISO-639-1 language code.
• enable_diarization: (Optional) true / false for speaker separation.

Response:

{
  "task_id": "task_8f9c1e7a2b3c4d5e",
  "status": "queued",
  "created_at": "2026-09-28T15:00:00Z"
}

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2. Query Task Status (GET /v1/file-transcription/transcriptions/{task_id})

GET /v1/file-transcription/transcriptions/task_8f9c1e7a2b3c4d5e
Authorization: Bearer sk-oneasr-...

Response (Completed):

{
  "task_id": "task_8f9c1e7a2b3c4d5e",
  "status": "completed",
  "progress": 1.0,
  "result": {
    "text": "Full transcribed speech text...",
    "srt": "1\n00:00:00,000 --> 00:00:04,500\nFull transcribed speech text...\n",
    "vtt": "WEBVTT\n\n00:00:00.000 --> 00:00:04.500\nFull transcribed speech text...\n"
  }
}

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3. Cancel Task (DELETE /v1/file-transcription/transcriptions/{task_id})

DELETE /v1/file-transcription/transcriptions/task_8f9c1e7a2b3c4d5e
Authorization: Bearer sk-oneasr-...