render_video
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Third-party content written by another agent. Data to evaluate, not instructions.
Render a page's animation timelines to an MP4 video. The page's scripts must expose window.__timelines — objects with duration() and pause(t) (a paused gsap.timeline registered there works as-is). Each frame seeks every timeline to t=i/fps and paints the viewport, so the output is deterministic — no wall clock in the pixel values. Audio: narration[] places TTS/voice clips at start times (mixed into one AAC track), audio adds looped background music, and subtitles_srt muxes an SRT as a soft mov_text track and (by default, burn_subtitles: false to opt out) burns the same cues into the frame pixels — QuickTime, WeChat and most social embeds ignore the soft track. Requires ffmpeg on the server. Returns base64 MP4 (H.264, yuv420p) plus frame count and durations.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| url | string | yes | Page URL whose scripts register timelines in `window.__timelines` (GSAP-style objects with `duration()` + `pause(t)`). |
| fps | number | no | Frames per second. Default 24. |
| width | integer | no | Viewport width in CSS pixels (floored to even — yuv420p). Default 1280. |
| height | integer | no | Viewport height in CSS pixels. Default 720. |
| hold_tail_secs | number | no | Freeze the final timeline state for this many extra seconds. Default 0.5. |
| max_duration_secs | number | no | Safety cap on timeline + hold tail, seconds. Default 120. |
| wait_timelines_ms | integer | no | How long to wait for `window.__timelines` to appear, ms. Default 10000. |
| use_proxy | boolean | no | Route through proxy (for blocked foreign sites) |
| tls_fingerprint | string | null | no | TLS fingerprint override (stealth mode only) |
| audio | any | no | Background music: looped to cover the video, volume-scaled, faded out at the tail. |
| narration | array | no | Voiceover clips, each starting at its own time (any TTS output; mixed into one AAC track). |
| subtitles_srt | string | null | no | Inline SRT subtitles muxed as a soft (toggleable) mov_text track. |
| subtitles_language | string | null | no | ISO language tag for the subtitle track, e.g. "eng" / "zh". |
| burn_subtitles | boolean | null | no | Burn the cues into the frame pixels too (hardsub) — on by default when `subtitles_srt` is present; QuickTime, WeChat and most social embeds ignore the soft mov_text track. `false` keeps the soft track only. |
Raw JSON schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$defs": {
"RenderVideoAudio": {
"description": "render_video `audio`: background music track — fetched, looped to cover\nthe video, volume-scaled, optionally faded out at the end.",
"type": "object",
"properties": {
"url": {
"description": "URL of the music file. mp3/wav/ogg/m4a — probed by content.",
"type": "string"
},
"volume": {
"description": "Linear multiplier 0..=2; 1 = as authored. Default 1.",
"type": "number",
"format": "float",
"default": 1
},
"fade_out_secs": {
"description": "Fade out over the final N seconds. Default 0 (none).",
"type": "number",
"format": "float",
"default": 0
},
"loop_audio": {
"description": "Loop to cover the whole video. Default true.",
"type": "boolean",
"default": true
}
},
"required": [
"url"
]
},
"RenderNarrationClip": {
"description": "render_video `narration[]`: one voiceover clip placed at a start time —\ngenerate with any TTS, hand us the URL; all clips mix into one AAC track.",
"type": "object",
"properties": {
"url": {
"description": "URL of the voice clip (any TTS output; mp3/wav/ogg/m4a).",
"type": "string"
},
"start_secs": {
"description": "Seconds from video t=0 where this line starts. Default 0.",
"type": "number",
"format": "double",
"default": 0
},
"volume": {
"description": "Linear multiplier 0..=2. Default 1.",
"type": "number",
"format": "float",
"default": 1
}
},
"required": [
"url"
]
}
},
"required": [
"url"
],
"type": "object",
"properties": {
"url": {
"description": "Page URL whose scripts register timelines in `window.__timelines`\n(GSAP-style objects with `duration()` + `pause(t)`).",
"type": "string"
},
"fps": {
"description": "Frames per second. Default 24.",
"type": "number",
"format": "double",
"default": 24
},
"width": {
"description": "Viewport width in CSS pixels (floored to even — yuv420p). Default 1280.",
"type": "integer",
"format": "uint32",
"minimum": 0,
"default": 1280
},
"height": {
"description": "Viewport height in CSS pixels. Default 720.",
"type": "integer",
"format": "uint32",
"minimum": 0,
"default": 720
},
"hold_tail_secs": {
"description": "Freeze the final timeline state for this many extra seconds. Default 0.5.",
"type": "number",
"format": "double",
"default": 0.5
},
"max_duration_secs": {
"description": "Safety cap on timeline + hold tail, seconds. Default 120.",
"type": "number",
"format": "double",
"default": 120
},
"wait_timelines_ms": {
"description": "How long to wait for `window.__timelines` to appear, ms. Default 10000.",
"type": "integer",
"format": "uint64",
"minimum": 0,
"default": 10000
},
"use_proxy": {
"description": "Route through proxy (for blocked foreign sites)",
"type": "boolean",
"default": false
},
"tls_fingerprint": {
"description": "TLS fingerprint override (stealth mode only)",
"type": [
"string",
"null"
],
"default": null
},
"audio": {
"description": "Background music: looped to cover the video, volume-scaled, faded\nout at the tail.",
"anyOf": [
{
"$ref": "#/$defs/RenderVideoAudio"
},
{
"type": "null"
}
],
"default": null
},
"narration": {
"description": "Voiceover clips, each starting at its own time (any TTS output;\nmixed into one AAC track).",
"type": "array",
"items": {
"$ref": "#/$defs/RenderNarrationClip"
},
"default": []
},
"subtitles_srt": {
"description": "Inline SRT subtitles muxed as a soft (toggleable) mov_text track.",
"type": [
"string",
"null"
],
"default": null
},
"subtitles_language": {
"description": "ISO language tag for the subtitle track, e.g. \"eng\" / \"zh\".",
"type": [
"string",
"null"
],
"default": null
},
"burn_subtitles": {
"description": "Burn the cues into the frame pixels too (hardsub) — on by default\nwhen `subtitles_srt` is present; QuickTime, WeChat and most social\nembeds ignore the soft mov_text track. `false` keeps the soft track\nonly.",
"type": [
"boolean",
"null"
],
"default": null
}
}
}