Autostreaming Different Multicast address on same channel

[Whsperz]

As the subject states, I am looking to autostream different Multicast address on the same channel every 20 secs, indefinitely in a loop. This is for channel monitoring to ensure that all channels are in service. Some help on a where to start with the config file would be a great help. Here's what I can gather from doing some research.

new channel1 broadcast enabled loop
setup channel1 input udp://@239.0.1.2:1234
setup channel1 input udp://@239.0.1.3:1234
setup channel1 input udp://@239.0.1.4:1234

new mysched schedule enabled
setup mysched date now
setup mysched period 00:00:20
setup mysched append control channel1 play

This config will start the first multicast stream but will not change to the next. What am I missing?

[ibstars]

Try this, just change the channel numbers

setup channel1 input udp://@239.0.1.2:1234
setup channel2 input udp://@239.0.1.3:1234
setup channel3 input udp://@239.0.1.4:1234

control channel1 play
control channel2 play
control channel3 play