Hi, Ryan,
Thank you for your help here. I did execute the HDHomeRun command line scan and then the appropriate awk sequence, so I now have a file which looks (to me) to be of the format that TVHeadend wants to to find all the muxes. However, with my installation of TVHeadend, I do not "already" have that full directory path to place this new file; I did not have the "tvheadend" directory under /usr/local/... so I went ahead and created that subdirectory path to place my file under ".../atsc/us_OH_Cleveland"
From my initial attempts, I am unable to get TVHeadend to find/see this file under its list of US locations. TVHeadend did some more unsuccessful scanning for muxes last night.
I admit that I am not fully understanding how TVHeadend works and "what I should be doing" to make it work. Sometimes I find the "localhost:9981" UI locked up, at which point I make efforts to "restart" TVHeadend, which then leads to "page not found"... and then I just end up rebooting. Sometimes, it seems to me, TVHeadend just starts scanning (ultimately unsuccessfully) on its own as soon as I open up the localhost:9981 UI.
Yes, I am confused and frustrated (and impatient) with this. You've definitely helped me get one step closer here, but it sounds like you have gotten an additional step closer than I. I will keep researching and experimenting with this.
Thanks again for your help.
Greg