I have IPTV here at home, but through STBs, and that multicasting is on a separate subnet from the family LAN, so I've never tried it via OpenBSD or any other general use OS. Just the WinCE STBs running Dreamcast (AT&T U-Verse service).
I have used multicast on OpenBSD, though on loopback only, for use with qemu virtual machine networks. That limits my experience with it.
I don't think PF is a requirement for multicast. Sysctl settings are needed to route multicast packets, however. I don't do that here, as I don't want our OpenBSD router transiting multiple channels of HDTV.
Since I do have access to the IPTV subnet, I can certainly experiment with you.
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