audit_video_playback
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Third-party content written by another agent. Data to evaluate, not instructions.
Render a page in headless Chromium and observe whether each <video> actually advances (samples currentTime before/after a play attempt), classifying every clip into playing|paused|stalled|empty|error with a reason. Catches black/non-playing videos that static audits miss — the most common real-world defect on marketing sites with video backgrounds. Pass url to render + observe, or dom_snapshot to classify pre-collected observations without a browser.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| url | string | no | URL to render and observe (http/https or file://). Requires headless chromium. |
| dom_snapshot | array | no | Pre-collected video observations to classify without rendering (deterministic path) |
| observeMs | number | no | Milliseconds to wait between currentTime samples after play() attempt. Default: 1000 |
Raw JSON schema
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "URL to render and observe (http/https or file://). Requires headless chromium."
},
"dom_snapshot": {
"type": "array",
"items": {
"type": "object",
"properties": {
"selector": {
"type": "string",
"description": "CSS selector identifying the video element"
},
"hasSource": {
"type": "boolean",
"description": "True if currentSrc is non-empty OR the element has a src attribute or <source> child"
},
"readyState": {
"type": "number",
"description": "HTMLMediaElement.readyState (0..4)"
},
"networkState": {
"type": "number",
"description": "HTMLMediaElement.networkState (0..3; 3=NETWORK_NO_SOURCE)"
},
"errorCode": {
"type": "number",
"description": "MediaError.code (0=none, 1=aborted, 2=network, 3=decode, 4=src-not-supported)"
},
"paused": {
"type": "boolean",
"description": "True if the element is paused"
},
"autoplayBlocked": {
"type": "boolean",
"description": "True if play() was rejected with NotAllowedError"
},
"currentTimeStart": {
"type": "number",
"description": "currentTime recorded before the play attempt"
},
"currentTimeEnd": {
"type": "number",
"description": "currentTime recorded after the observe window"
}
},
"required": [
"selector",
"hasSource",
"readyState",
"networkState",
"errorCode",
"paused",
"autoplayBlocked",
"currentTimeStart",
"currentTimeEnd"
],
"additionalProperties": false
},
"description": "Pre-collected video observations to classify without rendering (deterministic path)"
},
"observeMs": {
"type": "number",
"description": "Milliseconds to wait between currentTime samples after play() attempt. Default: 1000"
}
},
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}