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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/MediaSource/duration below:

MediaSource: duration property - Web APIs

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The duration property of the MediaSource interface gets and sets the duration of the current media being presented.

A double. A value in seconds is expected.

The following exceptions may be thrown when setting a new value for this property.

InvalidAccessError DOMException

Thrown if an attempt was made to set a duration value that was negative or NaN.

InvalidStateError DOMException

Thrown if MediaSource.readyState is not equal to open, or one or more of the SourceBuffer objects in MediaSource.sourceBuffers are being updated (i.e., their SourceBuffer.updating property is true.)

The following snippet is based on an example written by Nick Desaulniers (view the full demo live, or download the source for further investigation). The function getMediaSource(), which is not defined here, returns a MediaSource.

const mediaSource = getMediaSource();

function sourceOpen() {
  console.log(this.readyState); // open
  const sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
  fetchAB(assetURL, (buf) => {
    sourceBuffer.addEventListener("updateend", () => {
      mediaSource.endOfStream();
      mediaSource.duration = 120;
      video.play();
      console.log(mediaSource.readyState); // ended
    });
    sourceBuffer.appendBuffer(buf);
  });
}

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