[mythtv-users] commercial flagging

Trey Thompson treythompson at gmail.com
Tue Dec 5 16:43:13 UTC 2006

> > No, he means the rating symbol, exactly what he's describing.  I started
> > coding something to detect this one time, but never committed anything
> > to SVN.  Logo Detection should not pick this up since it only occurs
> > for a short period after commercial breaks, and not throughout most of
> > the video like a normal logo does.  In fact, in current SVN, you'll see
> > a call to CheckRatingSymbol() commented out because I never got it working
> > well enough to commit.  I haven't looked at that in years though, and
> > have some different ideas now, so it could be possible, but it's not
> > high on my priority list right now.  The rating symbols could be detected
> > using the same edge-detection logic that we use to detect a normal logo,
> > just that we would only expect the rating symbol to be around for a short
> > while after each commercial break.
> >
> >
> I've had thoughts along these same lines but never really cared to
> mention them because my idea mostly revolves around U.S only (I
> think.)  If I understand TV ratings correctly here in the U.S. (and
> more importantly how the V-Chip works) all shows have the rating
> embeded in the VBI (same area as captions?) data.  If that is the
> case, the kicker would be that if the commercials are not rated, they
> ideally would not contain this ratings data, and thus could be easily
> detected.  I've been meaning to test this on my daughters TV where I
> have it set to TV-G (or something), and I want to see what happens on
> a 'blocked' program during a commercial break.  If the commercials
> show while the acutal program is blocked, this would lead me to
> believe that the data is there to be retrieved.
> This method has been discussed (not in great detail) on the dev list
> here:  http://www.gossamer-threads.com/lists/mythtv/dev/139458?search_string=commercial%20rating;#139458
> I think it sounds good, but I don't know how plausible it is.

On a similar note, I've never seen Closed Captioning on a commercial.
Maybe they are out there, maybe I just don't remember.  But, I don't
THINK I've ever seen it.  So, on a CC show, you could try that.

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