[mythtv] Multirec and recording earlystart/latefinish preferences?

[Another Sillyname]

Hi

I've noticed recently, even though I've got 4 physical DVB-T tuners,
each running with 2 channel multirec, so 8 virtual tuners, that my
recording rules seem to be running unlike the way I would expect them
to, specifically.

I happen to have 4 simultaneous recordings happening that are using
tuners thus:-

Terr1/1 - Program 1
Terr1/2 - Uncommitted
Terr2/1 - Program 2
Terr2/2 - Uncommitted
Terr3/1 - Program 3
Terr3/2 -Uncommitted
Terr4/1 - Program 4
Terr4/2 - Uncommitted

This is the behaviour I would expect, however Program 2 on Terr2/1 has
a late finish of 5 minutes programmed into it and the immediate
following program (Program 5) on the same channel has a 5 minute early
start programmed.  This means there's a 10 minute overlap.  However
the scheduler instead of using say Terr2/2 to record Program 5 (which
by definition must be on the same Mux as Program 2 as it follows it on
the same channel) instead is choosing to record a later showing.

I think I've seen situations before where programs with built in
latefinish times are 'cut short' to accommodate 'earlystart' times of
the following program instead of using the available Multirec tuner on
the same Mux to record both the latefinish program fully and also
record the earlystart program fully.

Is there a specific reason for this or is it the way the logic in the
scheduler is working?

Thanks in advance and hope my explanation made sense.