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How do I send RTSP video to a program that reads from a character device?

I have an IP-CAM that streams video over RTSP and I want to detect bar codes from it with zbarcam (from Ubuntu's zbar-tools package). According zbarcam's manual, it expects to be given a video4linux ...
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How can I remove a carriage return, add a time stamp and ignore some data from a live MQTT feed

I type mosquitto_sub -d -t +/# from the Ubuntu terminal to access the MQTT stream. Real output from the live MQTT stream is this: Sending PINGREQ Received PINGRESP Sending PINGREQ Received PINGRESP ...