[mythtv] ATSC question

Tim blooflame at comcast.net
Tue Feb 23 02:08:54 UTC 2010

As I see it, the advantage of ATSC content identifiers would be the ability
to record items without worrying about time information. Without,
admittedly, knowing how the directory information you're talking about works
(Schedules Direct or whatever), it depends upon accurate start/stop times.
Using the headers in the ATSC data allows you to record information whether
or not the broadcaster shifted the program by a few minutes.

Tim Hare

-----Original Message-----
From: mythtv-dev-bounces at mythtv.org [mailto:mythtv-dev-bounces at mythtv.org]
On Behalf Of Stuart Morgan
Sent: Monday, February 22, 2010 3:02 PM
To: Development of mythtv
Subject: Re: [mythtv] ATSC question

On Monday 22 Feb 2010 19:29:25 Devin Heitmueller wrote:
> On Mon, Feb 22, 2010 at 1:44 PM, Tim <blooflame at comcast.net> wrote:
> > ATSC standards have a section for 'Content Identifiers'.  I am curious
> > to whether that kind of information gets passed through a tuner card to
> > the software, and whether software like MythTV uses it.  I have so far
> > been unable to determine if the data is actually included in information
> > from content providers; if anyone knows please post.
> Yeah, it's part of the ATSC PSIP spec, and the tuner will pass it
> through to the software if it wants it (it's sent on MPEG PID 0x1FFB).
>  It's required for broadcasters to send it, since it's used for V-Chip
> style content ratings.  The cable providers doing ClearQAM aren't
> required to send the info though, and as far as I know most do not.
> I don't know if MythTV actually uses any of the info though.

It doesn't. I can't speak for the North American devs, but it's unlikely
use it, the same information only more detailed and thus more useful is 
probably included in the guide data (Schedules Direct, EIT or otherwise)?

Stuart Morgan
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