If you have a VxS configured to record multicast and you add an EVO-05 or EVO-12 camera, it will only record unicast, not multicast.
Pelco Video Management
EVO-05 Firmware version 1.9.18
EVO-12 Firmware version 1.4.96
You configure your VxS to record multicast, but instead end up recording unicast when using the ONVIF driver with your evolution camera.
Oncam Evolution camera does not support multicast when using ONVIF (EVO-05 & EVO-12)