what kind of factor could cause freezing picture time to time?The picture is freezing when there are a lot of customers watching one channel.
One of factor is that when hash-conflict taking place at GPBC board which causes the related program to can't be watched.
One of IPTV users MAC address can cause hash-conflict with multicast-program MAC at GPBC board, which means all of traffic belonging to this multicast-program would be discarded on GPBC because there is no related multicast-program entry, which is also the reason why there are a lot of “Drop frame for multicast filter”.
Hash-collision can't be solved completely, we only can avoid it or optimize it.
We can change the IP of program which causes the hash-conflict.
Or find out where is the IPTV user which causes conflict with program IP and change the MAC address of STB.