RFC 2326：Each SETUP request must be associated with a valid MediaSubsession #60
Description
In the mandatory requirements of the RTSP protocol specified in RFC 2326, each SETUP request must be associated with a valid MediaSubsession (i.e., a valid media resource description structure) after the RTSP session is created.
However, we have encountered counterexamples to this property during our usage. Below, we provide some seeds that violate this property, hoping they can help improve Live555!