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

[Chris Pinkham]

> 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