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130 lines
4.4 KiB
HTML
130 lines
4.4 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta content="width=device-width, initial-scale=1.0" name="viewport" />
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<title>webm VP9 distributed fixture</title>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
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<style>
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@import url("https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap");
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body,
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html {
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margin: 0;
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padding: 0;
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width: 640px;
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height: 360px;
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/* Transparent background — webm + yuva420p output preserves alpha,
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* which is the format's reason for existing. The renderer's
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* `initTransparentBackground` helper enforces this in production.
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*/
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background: transparent;
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overflow: hidden;
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font-family: "Space Mono", monospace;
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}
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#main-comp {
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position: relative;
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width: 640px;
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height: 360px;
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}
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.stage {
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position: absolute;
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inset: 0;
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}
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.label {
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position: absolute;
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top: 22%;
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left: 50%;
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transform: translateX(-50%);
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font-size: 18px;
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letter-spacing: 4px;
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color: #94a3b8;
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text-transform: uppercase;
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}
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.title {
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position: absolute;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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font-family: "Space Mono", monospace;
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font-size: 56px;
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font-weight: 700;
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color: #6366f1;
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white-space: nowrap;
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}
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.icon {
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position: absolute;
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bottom: 18%;
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left: 50%;
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transform: translate(-50%, 0);
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width: 48px;
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height: 48px;
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}
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</style>
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</head>
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<body>
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<div
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id="main-comp"
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data-composition-id="main-comp"
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data-width="640"
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data-height="360"
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data-start="0"
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data-duration="2"
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>
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<div class="stage" id="stage-a">
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<div class="label">CHUNK</div>
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<div class="title" id="title-a">PHASE ONE</div>
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</div>
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<div class="stage" id="stage-b" style="opacity: 0">
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<div class="label">CHUNK</div>
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<div class="title" id="title-b">PHASE TWO</div>
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</div>
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<!-- Small inline SVG icon; no external image fetch required. -->
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<svg class="icon" viewBox="0 0 48 48" xmlns="http://www.w3.org/2000/svg" id="icon">
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<circle cx="24" cy="24" r="18" fill="none" stroke="#6366f1" stroke-width="4" />
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<circle cx="24" cy="24" r="6" fill="#6366f1" />
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</svg>
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<!--
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No audio element on purpose. Opus frame quantization at 20ms grain
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pads a 2-second silent track past 2.0s of container time, which
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extends the muxed webm's duration past nb_frames/fps and trips the
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harness PSNR sampler at the very last checkpoint. Omitting audio
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keeps container duration == 2.0s exactly.
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-->
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</div>
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<script>
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// Build a single timeline pinned to the composition's wall-clock so
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// every frame is fully determined by the seek position. Chunk
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// boundaries at frames {15, 30, 45} sit inside the crossfade window
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// (frames 27-33 = 0.9s-1.1s) and the icon rotation — both of which
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// therefore exercise per-chunk state continuity AND VP9 closed-GOP
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// alpha encoding (`-auto-alt-ref 0` so chunk seams remain
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// independently decodable).
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const tl = gsap.timeline({ paused: true });
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window.__timelines = window.__timelines || {};
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window.__timelines["main-comp"] = tl;
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const stageA = document.getElementById("stage-a");
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const stageB = document.getElementById("stage-b");
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const icon = document.getElementById("icon");
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// Crossfade A → B straddling the frame-30 chunk seam. The opacity
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// animation goes through the alpha plane in yuva420p output, which
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// is exactly what we want to test under chunked-concat conditions.
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tl.to(stageA, { opacity: 0, duration: 0.2, ease: "none" }, 0.9);
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tl.to(stageB, { opacity: 1, duration: 0.2, ease: "none" }, 0.9);
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// Continuous icon rotation — the absolute angle at any time must
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// match across chunk boundaries, so a state-keeping regression in
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// the engine's virtual clock would show up as a rotation
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// discontinuity at frame 15, 30, or 45.
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tl.to(icon, { rotation: 360, duration: 2, ease: "none" }, 0);
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</script>
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</body>
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</html>
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