Disabling Capture Card or Card Input

Stop the backend, go into mythtv-setup and set the Input Connection to None for the card input you want to disable and the related video source, and then restart the backend.

Capture card, card input and video source configuration are left unchanged in the database, but the end result is that MythTV is unable to use that particular card input. When you want to re-enable the card input, go back into mythtv-setup and reconnect the Input Connection.