Right i have my box working and broadcasting on my network using DHCP and 
Multicast UDP

So box is transmitting a mpeg2 stream, box address is 192.168.1.51.

The mpeg stream a seen on Wireshark is 224.10.0.7 src port 1111 dst port 1234

Now i can see this if i vlc it on 224.10.0.7:1234

but if i try and change the broadcast address to 192.168.1.49 (my dhcp starts 
at 50) i see nothing on the network.

What i am trying to do is use my router to allow an outside connection to NAT 
from port 7777 to this stream

Do i need to add anything else apart from changing the address for the broadcast

Sorry for thisjoolz

code to setup port
        outUdp = udp_new();
        outAddr.addr = htonl( e2Prom.channelSettings.ipAddress);        // 
192.168.1.49
        udp_bind( outUdp, IP_ADDR_ANY, e2Prom.ethernetSettings.port);   // 1111
        udp_connect( outUdp, &outAddr, e2Prom.channelSettings.port);    // 1234
        outUdp->flags |= UDP_FLAGS_NOCHKSUM;
        outUdp->ttl = 0x38;

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