# recording.start
mutation write
Use when the requested change exactly matches recording.start; read the current state first when a version or identifier may have changed.
## Before calling
- Authenticate as the accountable Enhance person.
- Use only resource identifiers returned by an earlier capability result or supplied by the person.
- Reuse clientToken only when retrying this exact mutation input.
## Input
Show complete JSON Schema
```json
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"sourceUrl": {
"type": "string",
"maxLength": 2048
},
"viewport": {
"type": "object",
"properties": {
"width": {
"type": "integer",
"exclusiveMinimum": 0,
"maximum": 9007199254740991
},
"height": {
"type": "integer",
"exclusiveMinimum": 0,
"maximum": 9007199254740991
}
},
"required": [
"width",
"height"
],
"additionalProperties": false
},
"pageTitle": {
"anyOf": [
{
"type": "string",
"maxLength": 200
},
{
"type": "null"
}
]
},
"audio": {
"default": null,
"anyOf": [
{
"type": "object",
"properties": {
"mimeType": {
"type": "string",
"minLength": 1,
"maxLength": 100
},
"sampleRate": {
"type": "integer",
"minimum": 8000,
"maximum": 192000
}
},
"required": [
"mimeType",
"sampleRate"
],
"additionalProperties": false
},
{
"type": "null"
}
]
}
},
"required": [
"sourceUrl",
"viewport",
"pageTitle",
"audio"
],
"additionalProperties": false
}
```
### Example
Show example input
```json
{
"sourceUrl": "x",
"viewport": {
"width": 1,
"height": 1
},
"pageTitle": "x",
"audio": null
}
```
## Result
Returns a typed recording.start result from the Enhance API without transport-specific prose.
## Recovery
- BAD_REQUEST: correct the named fields and call again.
- UNAUTHORIZED: restore Enhance authentication, then retry once.
- FORBIDDEN or NOT_FOUND: check the supplied resource and selection; do not substitute unrelated content. Ask for corrected access or scope if needed.
- CONFLICT: read the current resource, merge the intended change, and retry with its version.
- INTERNAL: run Enhance diagnostics, report the failure, and stop repeating the call.
## Continue with
- Read the affected recording resource to confirm the result.
Compatibility: `7a9d9a432998d0a0db3f2dae4d4e338bf9819901f7ba1532945eee07bd0de171`.