Processing content streams that include additional content segments added in response to detection of insertion messages

A reader device monitors a content stream which includes a source stream that is received from a content source and modified by adding an additional content segment in response to detection of an insertion message. The reader detects an insertion message and signals a stream processing device. In response, the processing device performs an operation on the portion of the content stream that includes the additional content segment corresponding to the detected insertion message, which may include omitting performance of an operation that would have otherwise been performed. In some implementations, the reader and the processing device may be separate while in other implementations the reader may be integrated into the processing device. In various implementations, the reader and the processing device may be connected via one or more contact closures and the reader may signal the processing device by activating the contact closure.