A common solution is to use an IR Blaster: https://www.mythtv.org/wiki/Using_an_IR_Blaster_with_MythTV https://www.mythtv.org/wiki/Using_an_IR_Blaster_with_Myth

A common solution is to use an IR Blaster: https://www.mythtv.org/wiki/Using_an_IR_Blaster_with_MythTV https://www.mythtv.org/wiki/Using_an_IR_Blaster_with_MythTV I did something a little different. My cable box has a 3.5mm TRS jack to connect an external IR receiver to it. I connected the jack to an Arduino, and send serial commands to the Arduino from the MythTV box to change channels.