Hello,
I got IPTV trough my ISP which in this case is Telia and they sending out “internet” untagged and another VLAN tagged which in this case is it VLAN 845.
My setup look like this, I created a VLAN 100 for my LAN and VLAN 845 for my TV. I just bridging my VLAN 845 to another port on my router, so I do not need to anything with IGMP I guess.
My LAN works fine, no problem there at allt.
But my TV have som issues, the picture glichts (freeze in about 500milisecond/per 5-10min) and also the sound glitches which can be very annoying.
And of course works everything flawless if I use my ISP router.
And the problem Is still there if I upgrade to 6.39 which is the latest package.
My mikrotik model and firmware
model: 1100AH
current-firmware: 3.10
upgrade-firmware: 3.10
system package: 6.15
Now to the fun part! What should I look for to solve this issue? 
My router config are below
########################################################
/interface bridge
add l2mtu=1594 name=br-vlan100
add l2mtu=1594 name=br-vlan200
add name=br-vlan845 protocol-mode=none
/interface vlan
add interface=ether5 l2mtu=1594 name=trunk-vlan100-eth5 vlan-id=100
add interface=ether5 l2mtu=1594 name=trunk-vlan200-eth5 vlan-id=200
add interface=ether5 l2mtu=1594 name=trunk-vlan845-eth5 vlan-id=845
add interface=ether2 l2mtu=1594 name=vlan100 vlan-id=100
add interface=ether2 l2mtu=1594 name=vlan200 vlan-id=200
add interface=ether1-gateway l2mtu=1594 name=vlan845 vlan-id=845
/ip pool
add name=default-dhcp ranges=192.168.0.2-192.168.0.254
add name=wifi ranges=192.168.1.3-192.168.1.254
/ip dhcp-server
add address-pool=default-dhcp disabled=no interface=br-vlan100 name=dhcp1
add address-pool=wifi disabled=no interface=br-vlan200 name=wifi-dhcp
/interface bridge port
add bridge=br-vlan100 interface=ether3
add bridge=br-vlan100 interface=ether4
add bridge=br-vlan100 interface=ether2
add bridge=br-vlan100 interface=vlan100
add bridge=br-vlan845 interface=vlan845
add bridge=br-vlan100 interface=trunk-vlan100-eth5
add bridge=br-vlan845 interface=trunk-vlan845-eth5
add bridge=br-vlan200 interface=trunk-vlan200-eth5
add bridge=br-vlan200 interface=vlan200
add bridge=br-vlan845 interface=ether6 priority=0
/ip address
add address=192.168.0.1/24 interface=vlan100 network=192.168.0.0
add address=192.168.1.1/24 interface=vlan200 network=192.168.1.0
##############################################################
