[mythtv] ATSC question

Tim blooflame at comcast.net
Wed Feb 24 03:35:34 UTC 2010

Maybe I misread the ATSC specs. I thought the content provider was
responsible for providing the CIDs, as part of the header for each segment
of programming sent. In any event I was not thinking of some sort of guide
info download, but rather content identifiers sent at the beginning of each
new section of content, in order. That's really the only effective way I
could see for things like a V-chip or other content filtering to work.

I'll go back and read the specs again.


-----Original Message-----
From: mythtv-dev-bounces at mythtv.org [mailto:mythtv-dev-bounces at mythtv.org]
On Behalf Of Devin Heitmueller
Sent: Tuesday, February 23, 2010 9:53 AM
To: Development of mythtv
Subject: Re: [mythtv] ATSC question

On Mon, Feb 22, 2010 at 9:08 PM, Tim <blooflame at comcast.net> wrote:
> As I see it, the advantage of ATSC content identifiers would be the
> to record items without worrying about time information. Without,
> admittedly, knowing how the directory information you're talking about
> (Schedules Direct or whatever), it depends upon accurate start/stop times.
> Using the headers in the ATSC data allows you to record information
> or not the broadcaster shifted the program by a few minutes.

Unfortunately, it doesn't work that way.  The ATSC guide info is often
wrong if something unexpected happens (like a program running long).
It unfortunately is rarely more accurate than the SD guide.

You have to remember that the broadcaster is multiplexing this data
into the stream based on their database of guide info.  It is not just
forwarding some info embedded by the content producer.


Devin J. Heitmueller
AIM: devinheitmueller
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