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Showing content from https://webplatform.github.io/docs/apis/media_source_extensions/MediaSource/addSourceBuffer below:

addSourceBuffer · WebPlatform Docs

Creates a new SourceBuffer and adds it to the SourceBuffers property of the MediaSource.

Method of apis/media_source_extensions/MediaSourceapis/media_source_extensions/MediaSource

var sourcebuffer = MediaSource.addSourceBuffer(MIME type);

Data-type

String

The MIME type. This is expressed typically as ‘video/mp4’ or optionally as a MIME type and a codec: 'video/mp4;codecs=avc1.4d0020,mp4a.40.2’. Internet Explorer accepts both formats, though other browsers may require the codec be included.

Returns an object of type ObjectObject

Type: SourceBuffer The media source buffer.

This example gets a video object, creates a new MediaSource object, and assigns the MediaSource object to the src (source) of the video object. It then waits for the sourceopen event to fire, and then creates a video SourceBuffer using addSourceBuffer.

function setupVideo() {
  clearLog(); 

  
  if (window.MediaSource) {
    mediaSource = new window.MediaSource();
   } else {
    log("mediasource or syntax not supported");
    return;
  }
  var url = URL.createObjectURL(mediaSource);
  videoElement.pause();
  videoElement.src = url;
  videoElement.width = width;
  videoElement.height = height;

  
  
  mediaSource.addEventListener('sourceopen', function (e) {
    try {
      videoSource = mediaSource.addSourceBuffer('video/mp4');
      initVideo(initialization, file);
    } catch (e) {
      log('Exception calling addSourceBuffer for video', e);
      return;
    }
  },false);
}

 Exceptions:

INVALID_ACCESS_ERR If type is null or an empty string.

NOT_SUPPORTED_ERR If type contains a MIME type that’s not supported or a MIME type that’s not supported by SourceBuffer.

QUOTA_EXCEEDED_ERR If the mediaSource can’t handle any more SourceBuffer objects.

Media Source Extensions

W3C Candidate Recommendation

• Microsoft Developer Network.

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