Mix Surveillance And Ads On Public View Monitors?

I have a cusotmer with 4 LCD's showing live IP camera feed of 4 different studio's. These areas are having only 30-35% activities(motion) during each day. Now the new requirement is to play customer advertisement through DVD player or from computer(workstation) itself all the time during no motion event of relevant camera LCD. I can get alarm signal from VMS during no motion events from each camera feed but looking for a hardware device which can do the switching job. Any suggestions?????

I have seen Nextlevel HD decoder; which is suitable for the requirement but do anyone know better option in terms of price?

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