take_screencast
Capture a screencast of a web page over time with adaptive frame rates. Outputs individual PNG frames or an animated WebP file, ideal for monitoring page changes or creating visual timelines.
Instructions
Capture a series of screenshots of a web page over time, producing a screencast. Uses adaptive frame rates: 100ms intervals for ≤5s, 200ms for 5-10s, 500ms for >10s. PNG format: individual frames. WebP format: animated WebP with 4-second pause at end for looping.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| directory | No | Save screencast to directory. Specify format with "format" parameter. | |
| duration | No | Total duration of screencast in seconds | |
| format | No | Output format when using directory: "png" for individual PNG files, "webp" for animated WebP (default) | webp |
| height | No | Viewport height in pixels (max 1072) | |
| jsEvaluate | No | JavaScript code to execute. String: single instruction after first screenshot. Array: takes screenshot before each instruction, then continues capturing until duration ends. | |
| quality | No | WebP quality level (only applies when format is "webp"): low (50), medium (75), high (90) | medium |
| url | Yes | HTTP/HTTPS URL to capture | |
| waitUntil | No | Wait until event: load, domcontentloaded, networkidle0, networkidle2 | domcontentloaded |
| width | No | Viewport width in pixels (max 1072) |