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From: "Michael A. Terrell"
Subject: Re: Detection of television commercials
Date: Fri, 06 Dec 2002 20:46:43 -0500
Organization: Have you seen my bench? No, really! Where is it?
X-Mailer: Mozilla 4.61 [en]C-CCK-MCD (Win95; U)
Steve Andrew wrote:
> mike wrote:
> > A long time ago, there was an attempt to do this by looking at the
> > phase shift changes in the color burst when switching from one
> > source to another. Not sure that phase change exists in modern
> > systems.
> > If you come up with something, be sure to patent it. The advertisers
> > might pay BIG money for you NOT to license it.
> > mike
> > Richard Haendel wrote:
> >> Can anyone provide information on how to do this? I'm not looking to
> >> build a "commercial killer" but I need to record and log certain
> >> ones for a client.
> >> Thanks,
> >> Richard
> Here on the Gold Coast in Australia, I can receive both the Brisbane and
> Gold Coast Channel Ten Network. When movies are transmitted, the local
> transmitter carries the same movie as Channel Ten, based in Brisbane.
> Watching the two channels on separate receivers shows that the movie is in
> perfect sync. During a commercial break, the local transmitter shows local
> advertising, while the Brisbane channel carries separate advertising for
> Brisbane. At the end of the break, the movies resumes at exactly the same
> time. This indicates to me that both channels are using a common feed for
> the movie. As there is no discernible time difference between the two
> signals, the link is probably terrestrial microwave rather than via
> satellite. (We are around 50kM from Brisbane)
> I find it hard to believe that the affiliates advertising content is
> manually cued. I would have thought that there might be something in the
> signal sent by the network that cues the local add content. I suppose it's
> possible that the cueing information is carried on the inter-station link
> and not on the public signal.
> Thoughts anyone ?
Commercial insertion has been handled by computer for a long time.
They can send the data in the vertical interval, and the only way you
would see it is with a video waveform monitor that will trigger on a
selected line. Earlier systems used DTMF tones, or switching from a
stereo audio channel to mono for commercials. MTV used this to insert
commercials on CATV in the '80s. They also faded to black for a couple
frames, and you could hand insert a spot by having the tape cued and
paused, then hit play and switch sources during the black frames. A
bitch, but I did it in '85 & '86.
Michael A. Terrell
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