Make sure to select the IP Capture plug-in:

Press Device select

Select one of the IP Capture plug-ins

Click OK
Press Setup and specify the host address and the port for receiving the stream.

Click OK.

If the incoming stream is MPEG2 Transport Stream, Press Stream Filtering:

Select the filtering type and proceed accordingly

Check Use IP Streaming to send the captured stream to the network.

Check No capturing to disable writing the stream to a file.

Click OK

Press Manual Capture to start capturing.