SourceBuffer.appendBufferAsync()

The appendBufferAsync() method of the SourceBuffer interface begins the process of asynchronously appending media segment data from an ArrayBuffer or ArrayBufferView object to the SourceBuffer. It returns a Promise which is fulfilled once the buffer has been appended.

source

A BufferSource (that is, either an ArrayBufferView or ArrayBuffer) which contains the media segment data you want to add to the SourceBuffer.

A Promise which is fulfilled when the buffer has been added successfully to the SourceBuffer, or null if the request could not be initiated.

This simplified example async function, fillSourceBuffer(), takes as input parameters BufferSource, buffer, and a SourceBuffer to which to append the source media from the buffer.

async function fillSourceBuffer(buffer, msBuffer) {
  try {
    while(true) {
      await msBuffer.appendBufferAsync(buffer);
    }
  } catch(e) {
    handleException(e);
  }
}

This feature is not part of any specification. It is not on track to become a standard.

• Media Source Extensions API
• SourceBuffer.appendBuffer()
• MediaSource
• SourceBufferList