[mythtv-users] How well does commercial detection work?

Curtis Stanford curtis at stanfordcomputing.com
Fri Apr 1 04:29:16 UTC 2005


On Mar 31, 2005, at 7:57 PM, Chris Pinkham wrote:

>> I agree, the strict option does help a lot. It's hard to be objective
>> about it but it seems just about as good as it was when the ALL option
>> was first introduced. I'm wondering if my picture is confusing it. My
>> cable box produces light and dark lines that scroll up the picture
>> constantly. Very subtle, but it might confuse the commercial scanner.
>>
>> Curtis
>
> Yes, wavy lines or static can play havoc with the detection.  If you
> have a noisy signal, the "blank" frames won't seem blank since they
> may have very dark pixels and a some very light pixels so the code
> won't pick them up.  I tried to work around this one time by assuming
> the frame was blank if only X% was light while the rest was dark,
> but that caused false positives as well like for instance a nighttime
> scene of people driving in a car where most of the frame is dark but
> there are a few light spots.  It's definitely an art but getting
> better over time I believe.

Yes, it absolutely is getting better. It's a very hard problem and 
you've done a great job getting it working as well as it is, even with 
the wavy lines... :-)

Curtis



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