Multicast video

I'm using a PTP link between 2 8devices boards with relayd, one is AP, the other STA. The setup works fine, except when the video encoder sends multicast video to the decoder (cctv setup). It uses about 16mbps and it doesn't make it through, its very laggy and constantly breaks up. The same setup works fine with MikroTik or ubnt PTP links. Is there a package I need to able to pickup multicast?

Thanks