From: "Tony Newman"
Subject: Re: Detection of television commercials
Date: Sat, 07 Dec 2002 21:19:07 -0800 (PST)
Organization: Who says I'm organized!
Reply-To: "Tony Newman"
X-Newsreader: PMINews 2.00.1205 For OS/2
On Fri, 06 Dec 2002 07:04:06 GMT, 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.
Assuming USA TV standards here...
If you can get your client to put something special on line 20 of the
vertical interval, you stand a good chance of being able to detect that
and do your logging. I work at a TV station, and had to make sure line
20 wasn't getting blanked anywhere because Nielson (probably spelled
that wrong) uses line 20 for pretty much the same purpose on some
national spots. Line 21 is out - that's where closed captioning lives.
I think line 22 *might* be available, but that's getting awfully close
to the start of picture content.
As for the other discussions in this thread about "flags" or other
signals in the Network feed. ABC doesn't seem to do it. We get timing
info from the Network and roll mostly by the clock.
In live sports, you'll hear the Network announcers say something like
"We'll be back after these messages and a word from your local station"
That alerts us that a local break is imminent. We have information on
what will be in the Network portion of the break, and when the last
item starts, we know to roll our break right after.
It's been working this way since before personal computers existed.
There is some automation now, but it still depends on acccurate timing
of show segments, and spot lengths. I suppose part of the problem is
getting all the show and spot producers to agree on the same signaling
format. It's not just the ABC Network, we have to deal with shows made
by Paramont, Warner Bros., Buena Vista, and just about anybody who can
arrange magnetic spots on metal-coated mylar. (well, sometimes it's