[mythtv-users] X-Factor Scheduling Snafu

jzigpublic jzigpublic at gmail.com
Thu Oct 20 12:45:12 UTC 2011

On 10/19/2011 8:11 PM, Michael T. Dean wrote:
> On 10/19/2011 11:59 AM, Brian J. Murrell wrote:
>> On 11-10-19 11:48 AM, Roger Horner wrote:
>>> Since --dd-grab-all first deletes all your schedule data, if it starts just before you are about to record a program, wouldn't it cause you to miss the first 2 minutes of your program (assuming it takes 2 minutes to run as Kris B. says) since without schedule data your BE no longer knows to record it?
>> Hrm.  Is this really true?  This seems like a good case for building the
>> new schedule before deleting the old one and keeping the "no schedule"
>> time/lock to a very minimum while the already-built, new schedule is
>> simply swapped in and the old one swapped out.
> The only "potential danger" time comes between:
> 2011-10-18 06:05:46.852 Clearing data for source.
> and
> 2011-10-18 06:05:56.909 Program table update complete.
> in your mythfilldatabase log file.  That is the period during which you
> may be missing listings data for now.  My mythfilldatabase runs with
> --dd-grab-all take a total of 60s, and (as you can see, above,) only 10
> seconds are in the "potential danger" period.  So, for a user with a
> 2-minute mfdb run time, I'm guessing that the "potential danger" window
> is much shorter than 2 minutes.
> With a 10s "potential danger" window, --dd-grab-all isn't a concern to
> me (and has many times saved recordings due to last-minute schedule
> changes on the day of airing and has never caused any problems for me
> since I started using --dd-grab-all on August 31, 2010 (
> http://www.gossamer-threads.com/lists/mythtv/users/449426#449426 )).
> This isn't to say it shouldn't be a concern to anyone--each user must
> decide whether or not they trust it enough to run with it.
> In truth, during that "potential danger" period--due to the way
> mythfiilldatabase works, I'm estimating I actually have only a 5s window
> of actual danger.  Use the entire "potential danger" period for the
> conservative estimate or about half to three-fourths of it for the
> aggressive estimate (where 3/4 is more appropriate portion for much
> larger "potential danger" windows).
> Mike

What if you internet connection happened to be down when mfdb 
--dd-grab-all ran? Would you lose all scheduling info and have nothing 
till it ran again?
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