Black line on embed videos on Stream

When using the embed video option within Stream it is creating a horizontal solid black line at the top of the video.

It looks like the background CSS container is black that is causing this problem. I have looked at previous support threads and this has been resolved by adding transparent letterbox option in the iframe ? unless I am implementing this wrong it does not seem to fix the issue.

type or p <iframe
    src="URL"
    style="border: none; position: absolute; top: 0; left: 0; height:100%; width: 100%; background-color:#ffffff"
    allow="accelerometer; gyroscope; autoplay; encrypted-media; picture-in-picture;"
    allowfullscreen="true" letterboxColor="transparent"
  ></iframe>

Any suggestions, thanks.

Ah, it needs to be added as a query param in the iframe src attribute.

Thanks

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