How to make a video preview with canvas?

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by brandy , in category: Javascript , 3 months ago

How to make a video preview with canvas?

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1 answer

Member

by daisha , 3 months ago

@brandy 

To create a video preview using the HTML5 Canvas element, you can follow these steps:

  1. Create an HTML file with the necessary structure. Include a video element and a canvas element within the body tag.
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<!DOCTYPE html>
<html>
<head>
    <title>Video Preview</title>
</head>
<body>
    <video id="video" width="640" height="360" controls>
        <source src="video.mp4" type="video/mp4">
        Your browser does not support the video tag.
    </video>
    <canvas id="canvas" width="640" height="360"></canvas>
</body>
</html>


  1. Use JavaScript to capture frames from the video and draw them on the canvas. Add the following script in the HTML file between the opening and closing body tags.
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<script>
    const video = document.getElementById('video');
    const canvas = document.getElementById('canvas');
    const ctx = canvas.getContext('2d');

    video.addEventListener('play', () => {
        setInterval(() => {
            ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
        }, 1000 / 30);
    });
</script>


  1. Start the video playback and the frames will be drawn on the canvas in real-time.
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<script>
    video.play();
</script>


  1. Customize the video preview by altering the canvas size, frame rate, and other parameters in the JavaScript code.
  2. Test the video preview in a web browser to see the real-time display of frames from the video on the canvas.