If it's a television signal try tapping the adapter directly
cvlc -vvv atsc://frequency=57000 :dvb-adapter=0 :dvb-srate=0 :dvb-modulation=8VSB --programs=6 --sout '#standard{access=http,mux=ts,dst=192.168.1.201:32003}'
then you can catch the output on the ip and port in a ts format (or change the format if you like)
clint