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codeAugust 8, 2026•8 min read•RTSPLink Dev Team

WebCodecs API: Zero-Latency H.264 Browser Video Decoding

Bypass HTML5 video tag buffering and decode raw RTSP NAL units directly onto WebGL canvases using WebCodecs.

#WebCodecs#JavaScript#HTML5#WebGL#Low Latency
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#1VideoDecoder Setup in JavaScript

Initialize VideoDecoder with hardware acceleration:

WebCodecs VideoDecoder
const canvas = document.getElementById('render-canvas');
const ctx = canvas.getContext('2d');

const decoder = new VideoDecoder({
  output: (videoFrame) => {
    ctx.drawImage(videoFrame, 0, 0, canvas.width, canvas.height);
    videoFrame.close();
  },
  error: (e) => console.error('VideoDecoder Error:', e)
});

decoder.configure({
  codec: 'avc1.64001f', // H.264 High Profile
  hardwareAcceleration: 'prefer-hardware'
});

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