[mythtv] [mythtv-users] odd conflict with three tuners

[Daniel Walton]

Thanks for taking a look.  This is the only time I've seen a problem with the
scheduler so it's not a big deal.  I just wanted to get this out before saturday
rolls around and the problem disappears.

Daniel

On Thu, 28 Sep 2006, Bruce Markey wrote:

> Daniel Walton wrote:
> > Is this a bug or is this the intended behavior due to some corner case code in
> > the scheduler?
>
> It is the result of several intended behaviors and is a strange
> corner case.
>
> > Tuner
> > -----
> > #1     ESPN   College Football: Michigan at Minnesota  8:00pm -> 11:30pm
> > #1     ESPN   College Football Final                   12:00am -> 2:00am
> > Cflict FX     Thief: No Direction Home                 11:30pm -> 12:30am
> > #2     ESPN2  College Football: Georgia at Mississippi 9:00pm  -> 12:00am
> > #2     FX     Thief: Flight                            12:30am -> 1:30am
>
>
> Understood. Bummer. This happened because of the order all
> of the equal priority things were placed and the odd way they
> overlap. This could normally be fixed by moving one thing but
> resulted in a situation where it would have to move two.
>
> If you haven't yet, you can resolve this by any of: set the Thief
> priority to +1, "College Football Final" -1, add an override to
> just the first Thief, Georgia +1, Michigan -1. Just about anything
> other than the exact circumstance =).
>
> First, good job on reordering your inputs so that digital QAM is
> the first choice, right? Shows are placed by the lowest cardinputid
> but for simplicity, I'll refer to card 1 and 2 rather than inputs
> 2 and 3.
>
> College Football - "Michigan at 31 2031  30 20:00-23:30  1 2  S 1   0/0
> College Football - "Georgia at  32 2032  30 21:00-00:00  2 3  S 2   0/0
> Thief - "No Direction Home"     71 2071  30 23:30-00:30  0 0  A C   0/0
> College Football Final          31 2031  01 00:00-02:00  1 2  W 1   0/0
> Thief - "Flight"                71 2071  01 00:30-01:30  2 3  A 2   0/0
> Thief - "In the Wind"           71 2071  01 01:30-02:30  2 3  A 2   0/0
>
> All of these are priority 0 so the next criteria for order of
> placement is the record rule type. See "Scheduling decisions":
> http://www.mythtv.org/docs/mythtv-HOWTO-12.html#ss12.2 . The
> Single Football games go first and Michigan has an earlier start
> so it gets card 1 while Georgia gets card 2. Next the Weekly
> "College Football Final" The three "Thief" are the same priority
> and the same type All. The first episode doesn't fit on card 1 or
> 2 but this is normal and can be fixed later by trying to move
> "College Football Final". If there was just one "Thief", this
> would work itself out. However, the next thing to be place is
> another "Thief" which fits on 2 and overlaps "College Football
> Final". And now it's stuck. It can't move one thing to resolve
> the conflict, it would need to move two. We don't do this because
> it would be recursive, complex, slow and could result in looping.
>
> Currently, we try to fix conflicts by trying to move one thing
> (schedMoveHigher) after all showings at the same priority level
> have been placed. So, fix any problems after all the +2, again
> after all the +1 then after all the 0. Since these are all 0,
> (and even if they weren't, all the "Thief" are 0) it's too late
> to fix it.
>
> David had considered trying to fix each conflict as soon as it
> appeared but I showed a case where a -1 substitute could cause
> a priority 0 to end up as a conflict. We don't want lower priority
> to cause a higher priority to be a conflict. Still, I hadn't
> considered this circumstances. This might be solvable but the
> solution isn't obvious and this is a rare case. There used to be
> a more common case where four shows in a row overlapped with the
> first and fourth having the highest priority. That was solved
> but your case more subtle and takes five things to be arranged
> just so.
>
> David, now that I mention it, this really is a variation of
> the four overlaps problem. 1 = Michigan, 2 = Georgia, 3 = Thief,
> 4 = Final. 1 and 4 win card 1 so 3 can't be placed. The new twist
> is that 5 = Thief - "Flight" overlaps 4 also so 4 can't be moved
> and there is also 6 = Thief - "In the Wind" which also overlaps 4.
>
> --  bjm
>
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