app.perpetual.video
A local-first video editor that a browser agent can edit with you.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 9 · Act 22 · Transact 3 · Score: Not yet scored
Tool inspector
add_kinetic_captions
Transcribe the speech in one video clip and lay it over that clip as animated captions. Each line is typeset with its key phrase large, revealed word by word in time with the speech, placed to graze the subject, and masked so words pass behind the person on screen. This is a single finished effect — do not try to reproduce it with add_text. The user must approve the upload to Gemini, and it takes around a minute.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
overlayId |
integer | yes | — |
fromSeconds |
number | no | — |
toSeconds |
number | no | — |
maskSubject |
boolean | no | — |
color |
string | no | — |
fontFamily |
string | no | — |
Raw JSON schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"overlayId": {
"type": "integer",
"exclusiveMinimum": 0,
"maximum": 9007199254740991
},
"fromSeconds": {
"type": "number",
"minimum": 0,
"maximum": 36000
},
"toSeconds": {
"type": "number",
"minimum": 0,
"maximum": 36000
},
"maskSubject": {
"type": "boolean"
},
"color": {
"type": "string",
"maxLength": 64
},
"fontFamily": {
"type": "string",
"enum": [
"serif",
"sans"
]
}
},
"required": [
"overlayId"
],
"additionalProperties": false
}
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