This document discusses, among other things, systems and methods for receiving a local input video signal, processing the video signal, and providing a processed video signal to a local digital television display panel. A communications port includes an Ethernet or other communications network connector for allowing access to the video signal processing system by a remote device. This allows a remote user to remotely diagnose, debug, and even modify operation of the video signal processing system. In certain examples, this involves downloading a Lua script that can take partial or complete control over operation of the video signal processing system from resident instruction code. In certain examples, the video signal processing system includes pipelined image analysis or processing stages. Video signal data intermediate to such processing, or the processed video signal being provided to the local display can be communicated to the remote user.