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You appear to be subscribing to an image topic and a camera_info topic from different cameras, or the topics have been named in an unusual way.

The TimeSynchronizer requires that messages must have identical time stamps for the callback to be triggered. So if the time stamps are slightly different then the callback will never be executed.

In order to test this do you want to setup two normal subscribers which print out the topic name and time stamp for each topic, then you can debug the time stamps of both topics.