[mythtv] help needed to complete opaque logo commercial flagging.

[Marc Kessels]

Hi Chris,

I already tried to use nvp->JumpToFrame(0) and nvp->ClearAfterSeek(), but 
to no avail. Recently some changes were applied by you to change 
framesPlayed to framesRead. maybe I was also looking at the wrong value. 
However, the frames fetched using nvp->GetLastDecodedFrame() did contain 
the frame corresponding to framesPlayed.
If I understood the commercial detection code in CVS correctly, it was 
designed to detect semi-transparant logo's. (at least, the code contained a 
lot of edge detections). My code is only about non-transparant logo's. They 
are a bit easier to detect (but still I needed about 100 frames spread over 
30 minutes of recording)

thanks that you want to have a look at it. If you need additional 
explanation, please feel free to contact me.

Marc


At 07:39 2-12-2004, you wrote:
> > I almost finished some code about flagging commercials based on detecting
> > an opaque logo. However, while testing it, I could not find a method to
> > rewind the video stream back to the start after I had determined the logo
> > itself.
> > I tried to use JumpToFrame(0) and ResetPlaying(), but after a GetFrame(1)
> > (as is used in ProcessNextFrame) the frame counter increments to the frame
> > after the last decoded frame.
> >
> > So at the moment the code works very nice for the part of the show after
> > the first half hour. Who can help me a bit further to get the complete 
> show
> > flagged?
>
>The current logo detection does this in CommDetect::SearchForLogo().  Look
>for the following lines near the bottom of the method:
>
>     nvp->JumpToFrame(0);
>     nvp->ClearAfterSeek();
>
>I'll take a look at your patch tomorrow.  I've been working on logo
>detection a little, but if you have a better detection working then
>I could look at patching that in instead of tweaking what I currently
>have in CVS.
>
>--
>
>Chris
>
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