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trim video javascript

Mohammad alshraideh answered on February 17, 2023 Popularity 8/10 Helpfulness 4/10

answer trim video javascript

trim video javascript

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To trim a video using JavaScript,
you can use the HTML5 video element and the MediaSource API.
Here's a basic example:
```
<video id="my-video">
  <source src="my-video.mp4" type="video/mp4">
</video>

<button onclick="trimVideo()">Trim Video</button>

<script>
function trimVideo() {
  // Get the video element
  const video = document.getElementById('my-video');
  
  // Create a new MediaSource
  const mediaSource = new MediaSource();
  video.src = URL.createObjectURL(mediaSource);
  
  // Add an event listener for when the MediaSource is open
  mediaSource.addEventListener('sourceopen', () => {
    // Create a new SourceBuffer
    const sourceBuffer = mediaSource.addSourceBuffer('video/mp4; codecs="avc1.42E01E,mp4a.40.2"');
    
    // Fetch the video file
    fetch('my-video.mp4')
      .then(response => response.arrayBuffer())
      .then(buffer => {
        // Trim the video
        const start = 10; // Start at 10 seconds
        const end = 20; // End at 20 seconds
        const trimmedBuffer = trimBuffer(buffer, start, end);
        
        // Append the trimmed video to the SourceBuffer
        sourceBuffer.appendBuffer(trimmedBuffer);
      });
  });
}

function trimBuffer(buffer, start, end) {
  const newBuffer = new Uint8Array(end - start);
  for (let i = start; i < end; i++) {
    newBuffer[i - start] = buffer[i];
  }
  return newBuffer;
}
</script>

```
This example creates a video element with a source video file,
and a button that, when clicked, trims the video 
from 10 seconds to 20 seconds. When the button is clicked,
the trimVideo() function is called, 
which creates a new MediaSource object and sets the src 
of the video element to a URL created from the MediaSource.
It then adds an event listener for the sourceopen event,
which is called when the MediaSource is open and ready to receive data.

Inside the sourceopen event listener,
a new SourceBuffer is created with the MIME type video/mp4; codecs="avc1.42E01E,mp4a.40.2", which is the codec used for the video file in this example. The video file is fetched using fetch(), and the trimBuffer() function is used to trim the video file from 10 seconds to 20 seconds. Finally, the trimmed video is appended to the SourceBuffer using the appendBuffer() method.

Popularity 8/10 Helpfulness 4/10 Language html

Source: Grepper

Tags: html javascript trim video

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Contributed on Feb 17 2023

Mohammad alshraideh

0 Answers Avg Quality 2/10

trim video javascript

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