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chore: import upstream snapshot with attribution
2026-07-13 12:58:35 +08:00

190 lines
6.7 KiB
HTML

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<!--
REQUIRED: viewport must match your composition dimensions.
Landscape: width=1920, height=1080
Portrait: width=1080, height=1920
-->
<meta name="viewport" content="width=1920, height=1080" />
<!--
REQUIRED: data-composition-id identifies this composition.
Must match the key you register in window.__timelines below.
Optional: data-width/data-height help the producer determine resolution.
-->
<meta data-composition-id="my-video" data-width="1920" data-height="1080" />
<title>My Video</title>
<!-- REQUIRED: GSAP for timeline animations -->
<script src="https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/gsap.min.js"></script>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
width: 1920px;
height: 1080px;
overflow: hidden;
background: #000;
}
#stage {
position: relative;
width: 1920px;
height: 1080px;
overflow: hidden;
}
/*
REQUIRED: All timed clips need visibility: hidden.
The framework toggles visibility based on data-start/data-duration.
Never toggle visibility yourself in scripts.
*/
.clip {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
visibility: hidden;
object-fit: cover;
}
</style>
</head>
<body>
<div id="stage">
<!--
════════════════════════════════════════════════════
VIDEO CLIPS
════════════════════════════════════════════════════
REQUIRED attributes:
data-start — when the clip appears (seconds)
data-duration — how long the clip stays on screen (seconds)
(optional for video/audio — defaults to source duration)
data-track-index — z-stacking order + timeline track grouping
(higher = in front, clips on same track cannot overlap)
REQUIRED on <video>:
muted — framework manages audio via separate <audio> element
playsinline — prevents fullscreen on mobile
REQUIRED:
class="clip" — sets visibility: hidden so framework can manage lifecycle
DO NOT:
- Call video.play(), video.pause(), or set video.currentTime in scripts
- Toggle visibility in scripts
- Use the video element for audio (use a separate <audio> element)
-->
<video
id="el-video"
class="clip"
data-start="0"
data-duration="10"
data-track-index="0"
src="my-video.mp4"
muted
playsinline
></video>
<!--
════════════════════════════════════════════════════
IMAGE CLIPS
════════════════════════════════════════════════════
data-duration is REQUIRED for images (they have no intrinsic duration).
-->
<img
id="el-image"
class="clip"
data-start="10"
data-duration="5"
data-track-index="0"
src="my-image.png"
/>
<!--
════════════════════════════════════════════════════
AUDIO
════════════════════════════════════════════════════
Audio is invisible — no class="clip" needed (no visual to hide).
Use a separate <audio> element even if the source is the same .mp4 file.
The framework syncs audio playback to the timeline position.
Optional: data-volume="0.5" (0-1, default 1)
-->
<audio
id="el-audio"
data-start="0"
data-duration="15"
data-track-index="1"
data-volume="0.8"
src="my-video.mp4"
></audio>
<!--
════════════════════════════════════════════════════
TEXT / HTML OVERLAYS
════════════════════════════════════════════════════
Any div with data-start becomes a timed clip.
Content inside can be freely styled with CSS.
Animate visual properties (opacity, transform) with GSAP — fine.
Do NOT animate visibility — the framework owns that.
-->
<div
id="el-title"
class="clip"
data-start="1"
data-duration="4"
data-track-index="2"
style="display: flex; align-items: center; justify-content: center; z-index: 10"
>
<h1 style="font-family: sans-serif; font-size: 72px; color: white; opacity: 0">
Hello World
</h1>
</div>
</div>
<script>
/*
════════════════════════════════════════════════════
GSAP TIMELINE
════════════════════════════════════════════════════
REQUIRED: Create a paused GSAP timeline.
REQUIRED: Register it in window.__timelines with the SAME ID
as data-composition-id on the <meta> tag.
Without this registration, NOTHING works — no playback,
no seeking, no rendering. This is the #1 mistake.
*/
var tl = gsap.timeline({ paused: true });
// Animate visual properties only — opacity, transform, color, etc.
// The framework handles clip mounting/unmounting and media playback.
tl.to("#el-video", { opacity: 1, duration: 0.5 }, 0);
tl.to("#el-video", { opacity: 0, duration: 0.5 }, 9.5);
tl.to("#el-image", { opacity: 1, duration: 0.5 }, 10);
tl.to("#el-image", { opacity: 0, duration: 0.5 }, 14.5);
tl.to("#el-title h1", { opacity: 1, y: 0, duration: 0.8, ease: "power2.out" }, 1);
tl.to("#el-title h1", { opacity: 0, duration: 0.5 }, 4);
// REQUIRED: Register the timeline. The key MUST match data-composition-id.
window.__timelines = window.__timelines || {};
window.__timelines["my-video"] = tl;
</script>
</body>
</html>