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Why is RTP traffic from video encoders not getting captured?

Hi,

I have a series of IP9610E encoders and am trying to troubleshoot an issue and using Wireshark to see if I can eliminate the network or at least see what the traffic from the encoders is doing. The encoders are plugged into a Dell 3048 switch. They use RTP in a unicast connection to their respective decoders and have Fujitsu's FEC/ARQ enabled. I mirrored one of the ports from the encoder and plugged my computer into it. Wireshark is set to promiscuous mode and RTP capture enabled. I started the capture and immediately began capturing packets from all sorts of things on that VLAN, but none of the encoders' IP addresses showed up. ICMP traffic showed up however, when I pinged the encoders, but the video traffic didn't show up at all. Any idea why this is the case?