Windows folks now have their equivalent to MythTV. It’s just not open-source…and you have to buy Windows…and it doesn’t have as many plugins…and it doesn’t have as big a community behind it…But good luck with that 
What is GB-PVR? GB-PVR is a fully featured Personal Video Recorder (PVR), allowing you to schedule TV recordings and view and pause live TV. In additional to this PVR functionality, it also acts as a media center allowing you to watch movies, listen to music and view pictures. GB-PVR also supports specialist hardware decoders including Sigma Designs XCard, Hauppauge PVR350 and Hauppauge MediaMVP, with support the full application including On Screen Display (OSD). GB-PVR also supports multiple tuners, allowing you to record more multiple channels at one time.