# Revision history [back]

https://wiki.wireshark.org/RTP_statistics

RTP timestamp: RTP timestamp is based on the sampling frequency of the codec, 8000 in most audio codecs and 90000 in most video codecs. As the sampling frequency must be known to correctly calculate jitter it is problematic to do jitter calculations for dynamic payload types as the codec and it's sampling frequency must be known which implies that the setup information for the session must be in the trace and the codec used must be known to the program(with the current implementation).


The timestamps are in your pcap but not the setup info.

https://wiki.wireshark.org/RTP_statistics

RTP timestamp: RTP timestamp is based on the sampling frequency of the codec, 8000 in most audio codecs and 90000 in most video codecs. As the sampling frequency must be known to correctly calculate jitter it is problematic to do jitter calculations for dynamic payload types as the codec and it's sampling frequency must be known which implies that the setup information for the session must be in the trace and the codec used must be known to the program(with the current implementation).


The timestamps are in your pcap but not the setup info.