TSMonitor is a system for monitoring broadcast interactive applications and subtitles or closed captions. It is designed for use by broadcasters or playout centres wherever there is a need to monitor broadcast interactive applications, closed captions or subtitles, and other ancillary components within a transport stream. The innovative software implements a number of virtual receivers running on a single server, each executing a pre-defined, scripted functional test case. A web-browser-based user interface provides a simple ‘Traffic Light’ status display and enables operational staff to drill down into detail of alarms. All events are logged for compliance and analysis. The virtual receiver architecture significantly reduces rack and MCR video wall space requirements when compared to existing STB-based monitoring and logging solutions. Warnings or alarms are generated if the broadcast service deviates from the pre-defined test cases, so enabling timely operator intervention to rectify problems with playout.