fuzzy-coats

totalInterFrameDelay, and totalSquaredInterFrameDelay are video only

1

totalInterFrameDelay, totalSquaredInterFrameDelay are not marked with "Only [exist](https://infra.spec.whatwg.org/#map-exists)s for video."

In section 4.1 `scalabilityMode` should be marked as existing only for video encodings. This would match [scaleDownBy](https://www.w3.org/TR/webrtc/#dom-rtcrtpencodingparameters-scaleresolutiondownby).

Correct terminology for contributing sources in metadata

1

A single SSRC can have multiple participating users each with their own contributing sources, CSRCs. ### Description ### Motivation ### Additional details ### Related issues and pull requests