webcodecs-demos/index.html at main · sprangerik/webcodecs-demos · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>WebCodecs Demos</title>
    <link rel="icon" href="data:,">
    <style>
        body {
            font-family: sans-serif;
            margin: 20px;
            background-color: #f4f4f4;
            color: #333;
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        h1 {
            text-align: center;
            color: #0056b3;
            margin-bottom: 30px;
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            padding: 20px;
            border-radius: 8px;
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        h2 {
            color: #0056b3;
            border-bottom: 2px solid #eee;
            padding-bottom: 10px;
            margin-top: 30px;
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</head>
<body>
    <div class="container">
        <h1>WebCodecs API Demonstrations</h1>

        <p>This page provides links to demonstrations of various features of the <a href="https://www.w3.org/TR/webcodecs/" target="_blank">WebCodecs API</a>, which allows web applications low-level access to video and audio encoders and decoders.</p>

        <h2>Demos:</h2>
        <ul>
            <li>
                <h3><a href="ltr_demo.html">Long-Term Reference (LTR) Frames Demo</a></h3>
                <p>
                    Demonstrates the use of manual Long-Term Reference frames in video encoding with WebCodecs. This technique can improve video stream resilience to packet loss. The demo compares a standard encoding setup with one that utilizes LTR frames, simulating network loss and delay.
                </p>
                <p>
                    <strong>WebCodecs Features:</strong> <code>VideoEncoder</code> with <code>scalabilityMode: 'manual'</code>, <code>encode()</code> options like <code>referenceBuffers</code> and <code>updateBuffer</code>, <code>EncodedVideoChunk</code>, <code>VideoDecoder</code>.
                </p>
            </li>
            <li>
                <h3><a href="rate_control_demo.html">Rate Control Demo</a></h3>
                <p>
                    Compares browser internal rate control with an external JavaScript-based rate control algorithm (<code>SimpleRateController</code>) using WebCodecs. Users can adjust target bitrate and other parameters to observe the impact on video quality and stream size.
                </p>
                <p>
                    <strong>WebCodecs Features:</strong> <code>VideoEncoder</code> configuration for <code>bitrateMode: 'constant'</code> (internal RC) vs. <code>bitrateMode: 'quantizer'</code> (external RC), dynamic reconfiguration, <code>EncodedVideoChunk</code> metadata.
                </p>
            </li>
            <li>
                <h3><a href="webcodecs_manual_scalability.html">Manual Temporal Scalability Demo</a></h3>
                <p>
                    Illustrates manual temporal scalability using the <code>scalabilityMode: 'manual'</code> feature of WebCodecs with the AV1 codec. The demo encodes a single stream into multiple temporal layers, then decodes and displays different subsets of these layers to show the effect on frame rate and quality.
                </p>
                <p>
                    <strong>WebCodecs Features:</strong> <code>VideoEncoder</code> with <code>scalabilityMode: 'manual'</code>, <code>av1</code> encode options, <code>encode()</code> options for buffer management (<code>referenceBuffers</code>, <code>updateBuffer</code>), multiple <code>VideoDecoder</code> instances.
                </p>
            </li>
        </ul>
    </div>
</body>
</html>