So the real reason I wasn't using VDR is that my card is ATSC which is only supported with a patch to VDR. Are there plans to offer the patched version?
I went back to mythtv and got it working at the core. It looks like the issue within myth was the playback profile. If I use slim or normal, I get playback, otherwise, I get a blank screen. Of course, I still don't know if there is anything I need to do for MCE or just myth.
Afterward, I enabled diskless MDs and did a PXE boot. I noticed that the image starts myth-backend. Also, I am unable to get streamed TV from the core. Is this normal behavior and/or do I need to modify the image?