# Start Live Streaming

Start live streaming an uploaded MP4 on a Cloud Phone.
- **Preconditions**: the phone must be powered on and not held by another member, and the device must support live streaming. The `fileId` must refer to a file uploaded as live-stream media that finished uploading; anything else is rejected as invalid or expired.
- **Completion**: **accepted, not complete.** The response only confirms the service took the request. Poll `/cloudphone/live/status` until `liveStatus` is `1`.
- **Note**: the MP4-only restriction is enforced when you upload the file, not here.
- **Retry**: no deduplication; a repeat call re-issues the start command.

Documented business errors: `33300`, `33301`, `33401`, `33418`. See [Error Codes](../Getting%20Started/error-codes.md) for what each code means. Any operation can additionally return the common codes.

Endpoint: POST /api/cloudphone/live/start
Version: 2026-09-05

## Request fields (application/json):

  - `phoneId` (string, required)
    Cloud phone ID
    Example: 190000000000000001

  - `fileId` (string, required)
    ID of an uploaded MP4 live-streaming file (`uploadType=2`)
    Example: 820000000000000001

## Response 200:

  - `200` (unknown)
    Request processed; inspect `code` for the business result

## Response 200 fields (application/json):

  - `code` (integer, required)
    Business result code; `0` indicates success
    Example: 0

  - `msg` (string | null, required)
    Error message; null when successful
    Example: null

  - `requestId` (string, required)
    Request ID for troubleshooting
    Example: 1d4f3ea968664593860b94b35d4ebf5e

  - `data` (boolean, required)
    Whether the live-streaming operation succeeded