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			Whithout this change, the packet is miss interpretted as a valid one and breaks packet sequence as well as duration computation from prev. packet timestamp. Following description here https://www.rfc-editor.org/rfc/rfc5761#section-4. The second header byte is the best way to discriminate RTP data stream from RTCP packets. This change only focuses on the common scenario of Senders and Receiver report packets. Other RTCP packets are more ambiguous as they potentially conflict with payload types.