[mythtv] Mythbackend Fails to start with --generate-preview error

[R. G. Newbury]

Has anyone else experienced this? Is this a singular anomaly or a real bug?

I upgraded from SVN 16279 to 16399, and recently to 16479. The latter 
two both fail on 'service mythbackend restart' with a reported error 
like "--generate-preview requires --chanid and --starttime or --infile"

I had never seen that before and did not know mythbackend even had those 
command line parameters. Unfortunately, I am trying to start the daemon 
backend, not spawn the preview thread ( at least, I *think* that is what 
is supposed to happen, from a quick glance at the source code). I 
checked for errant pid files etc. too...and even a re-boot..

I have tried removing ALL myth* binaries, and all libmyth* libraries 
(plus 'rm -rf /usr/local/lib/mythtv) and even nuked the include and 
share entries, before ./configure, make && make install of the newer 
versions...NO JOY.

Does anyone have a clue as to why these recent builds FAIL this way?
I thought it might be database related, but copying back the 16279 
version got me up and running without any database changes.

And the configure I am using is the one that built 16279 (I think...but 
I cannot see anything dangerous in it, nor can I imagine what could be).

A thread search shows that danielk fixed #4370 in 15727 and cpinkham 
fixed 4482 in 15580. Nothing else pops up as referencing 
'generate-preview' recently.