This is wireshark text export of USB traffic from host to TV tuner with 'Time Display Format - Seconds Since Previous Displayed Packet' selected. Traffic was captured using usbmon on linux host when ...

Verify that your TV Tuner cards are being detected. I have had a lot of luck with the tuner cards I have thrown at TVHeadend. If you stick with the Avermedia/ Leadtek brands you should be okay. Now ...