The RTCRtpStreamStats dictionary's codecId property is a string which uniquely identifies the object that was inspected to produce the data in the RTCCodecStats for the RTP stream.
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RTCRtpStreamStats: codecId property
Value
A string which uniquely identifies the object from which the contents of the stream's RTCCodecStats are derived.
Specifications
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  No specification data found for api.RTCRtpStreamStats.codecId.
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 https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpStreamStats/codecId