# Notification events (/en/realtime-media/transcoding/reference/ncs-events) > For AI agents: see the complete documentation index at [llms.txt](/llms.txt). When you set up a server to [receive webhook, notifications](../build/receive-ncs-events), Agora notifies your server of the following Cloud Transcoding events: | Event Type | Event Name | Description | | ---------- | -------------------------- | ----------------------------------------------- | | 110 | `cloud_transcoder_started` | Cloud transcoder has started successfully | | 111 | `cloud_transcoder_stopped` | Cloud transcoder has been destroyed | | 112 | `cloud_transcoder_status` | Cloud transcoder runtime state has changed | | 113 | `cloud_transcoder_updated` | Cloud transcoder configuration has been updated | ## Common payload structure [#common-payload-structure] All cloud transcoding webhook events share this structure: * `taskId`: String. Cloud transcoding task ID. * `instanceId`: String. Instance ID from your Create request. * `sequence`: Number. Event sequence number. * `sendts`: Number. Timestamp when event was sent (Unix milliseconds). * `serviceScene`: String. Service identifier, always `"rtsc/cloud-transcoder"`. * `details`: JSON Object. Event-specific details (varies by event type). ## 110 `cloud_transcoder_started` [#110-cloud_transcoder_started] When you successfully call [`Create`](/en/api-reference/cloud-transcoding/restful) to create a Cloud Transcoder task, your server receives this event notification. **Sample payload**: ```json { "taskId":"1234", "instanceId":"123", "sequence":123, "sendts":1656573243385, "serviceScene":"rtsc/cloud-transcoder", "details":{ "event":"cloud_transcoder_started", "state":"Transcoder success", "createTs":1658112464000, "transcoder":{ "inputs":[ { "rtcChannel":"test01", "rtcUid":123, "audio":true, "video":false }, { "rtcChannel":"test01", "rtcUid":456, "audio":true, "video":true } ], "outputs":[ { "rtcChannel":"test01", "rtcUid":1000, "audio":true, "video":true } ], "userConfigDetail":"{XXXX}" } } } ``` **Payload parameters**: * `event`: String. Callback event type. For this event, it's `"cloud_transcoder_started"`, indicating successful creation of a cloud transcoder. * `state`: String. Cloud transcoding status. For this event, it's `"Transcoder success"`, indicating successful creation and start of cloud transcoding. * `createTs`: Number. Unix timestamp (seconds) when the cloud transcoder was created. * `transcoder`: JSON Object. Input and output configuration of the cloud transcoder. * `inputs`: JSON Array. Audio/video input source configuration. * `rtcChannel`: String. RTC channel name for the audio/video input source. * `rtcUid`: Number. UID corresponding to the audio/video input source. * `audio`: Boolean. Whether audio input source exists (`true`: has audio input, `false`: no audio input). * `video`: Boolean. Whether video input source exists (`true`: has video input, `false`: no video input). * `outputs`: JSON Array. Audio/video output configuration. * `rtcChannel`: String. RTC channel name for the output audio/video. * `rtcUid`: Number. UID corresponding to the output audio/video. * `audio`: Boolean. Whether audio output exists (`true`: has audio output, `false`: no audio output). * `video`: Boolean. Whether video output exists (`true`: has video output, `false`: no video output). * `userConfigDetail`: String. The `cloudTranscoder.config` value from the Create request. ## 111 `cloud_transcoder_stopped` [#111-cloud_transcoder_stopped] This event is sent when the Cloud Transcoder is destroyed, either manually or due to an error. **Sample payload**: ```json { "taskId": "1234", "instanceId": "123", "sequence": 123, "sendts": 1656573243385, "serviceScene": "rtsc/cloud-transcoder", "details": { "event": "cloud_transcoder_stopped", "stopReason": "Stop request", "createTs": 1658112464000, "updateTs": 1658112464000 } } ``` **Payload parameters**: * `event`: String. Callback event type. For this event, it's `"cloud_transcoder_stopped"`, indicating successful destruction of a cloud transcoder. * `stopReason`: String. Reason for cloud transcoding stoppage. Could be due to calling the Delete API or other exceptional reasons. You can use this field to troubleshoot abnormal cloud transcoding stops. * `createTs`: Number. Unix timestamp (seconds) when the cloud transcoder was created. * `updateTs`: Number. Unix timestamp (seconds) when the cloud transcoder was destroyed. ## 112 `cloud_transcoder_status` [#112-cloud_transcoder_status] This event is triggered when the Cloud Transcoder's runtime state changes after it is created. **Sample payload**: ```json { "taskId": "1234", "instanceId": "123", "sequence": 123, "sendts": 1656573243385, "serviceScene": "rtsc/cloud-transcoder", "details": { "event": "cloud_transcoder_status", "state": "running", "createTs": 1658112464000, "updateTs": 1658112464000 } } ``` **Payload parameters**: * `event`: String. Callback event type. For this event, it's `"cloud_transcoder_status"`, indicating cloud transcoder runtime status change. * `state`: String. Cloud transcoding status. Possible values: * `"connecting"`: Connecting to Agora business servers. * `"running"`: Operating normally, performing cloud transcoding. * `"failed"`: Cloud transcoding failed. * `createTs`: Number. Unix timestamp (seconds) when the cloud transcoder was created. * `updateTs`: Number. Unix timestamp (seconds) when the cloud transcoder status was updated. ## 113 `cloud_transcoder_updated` [#113-cloud_transcoder_updated] This event is triggered after you successfully call [`Update`](/en/api-reference/cloud-transcoding/restful) to update the Cloud Transcoder configuration. **Sample payload**: ```json { "taskId": "1234", "instanceId": "123", "sequence": 123, "sendts": 1656573243385, "serviceScene": "rtsc/cloud-transcoder", "details": { "event": "cloud_transcoder_updated", "state": "running", "createTs": 1658112464000, "updateTs": 1658112464000, "transcoder": { "inputs": [ { "rtcChannel": "test01", "rtcUid": 123, "audio": true, "video": false }, { "rtcChannel": "test01", "rtcUid": 456, "audio": true, "video": true } ], "outputs": [ { "rtcChannel": "test01", "rtcUid": 1000, "audio": true, "video": true } ], "userConfigDetail": "json_string" } } } ``` **Payload parameters**: * `event`: String. Callback event type. For this event, it's `"cloud_transcoder_updated"`, indicating cloud transcoder configuration update. * `state`: String. Cloud transcoding status. `"running"` means the cloud transcoder is operating normally and performing cloud transcoding. * `createTs`: Number. Unix timestamp (seconds) when the cloud transcoder was created. * `updateTs`: Number. Unix timestamp (seconds) when the cloud transcoder configuration was updated. * `userConfigDetail`: String. Configuration content from the request body (`cloudTranscoder.config`). * `transcoder`: JSON Object. Input and output configuration of the cloud transcoder. * `inputs`: JSON Array. Audio/video input source configuration. * `rtcChannel`: String. RTC channel name for the audio/video input source. * `rtcUid`: Number. UID corresponding to the audio/video input source. * `audio`: Boolean. Whether audio input source exists (`true`: has audio input, `false`: no audio input). * `video`: Boolean. Whether video input source exists (`true`: has video input, `false`: no video input). * `outputs`: JSON Array. Audio/video output configuration. * `rtcChannel`: String. RTC channel name for the output audio/video. * `rtcUid`: Number. UID corresponding to the output audio/video. * `audio`: Boolean. Whether audio output exists (`true`: has audio output, `false`: no audio output). * `video`: Boolean. Whether video output exists (`true`: has video output, `false`: no video output).