[mythtv] Another commercial flagging method

[Liam Day]

I've been experimenting with commercial detection some more and I think I 
have a pretty good method now. It looks for suspicious events in the form of 
blackframe scenes of a standard length and scenechanges at ten second 
boundries. Then it tries all combinations of blackscene-bordered intervals 
and gives them a rating based on their length and the number of events they 
capture. After a bit of tidying of unusually long or short intervals the 
rest are used for the cutscenes. It can be foxed when a show starts with 
"here's what happened last week ... blackframe" but apart from that it seems 
pretty good. I don't know how well it would cope with NTSC as it wants to be 
within two frames for the ten-second test and the framrate doesn't fit well 
with integers. Any thrashing is appreciated, the patch needs to be applied 
to fresh cvs.

Liam

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