[mythtv] "SOP: SERVICE 173" on qam cable...what is it? can myth use it?

Michael Freeman mlfreeman at gmail.com
Tue Jan 10 05:27:59 UTC 2006

hmm.  when i played the raw capture in my windows box, i could hear audio,
pauses, more audio, done. so maybe the guide hides on the back of a QAM256
audio channel.
if someone wants to look at it (since maybe there's something that would
work across the comcast world in it), i can post it.
i'd try, but, well, i'm sure i'd still be trying to figure it out when
someone here made it work with myth.

from what little i can figure out, the first problem is the lack of the
0x1ffb PID that the ATSC spec says is some sort of a master PID.

On 1/9/06, Daniel Kristjansson <danielk at cuymedia.net> wrote:
> On Mon, 2006-01-09 at 23:43 -0500, Michael Freeman wrote:
> > I was scanning around my comcast feed with my pchdtv 3000 when i
> > locked onto something interesting...channel 93 had a ton of PIDs
> > between 0x1000 and 0x1ffb (but no 0x1ffb entry).  Cracking this file
> > open in a hex editor reveals a lot of things called "SOP: SERVICE"
> > followed by what look suspiciously like digital channel numbers (for
> > instance, 173 is ESPN HD here...and I saw a "SOP: SERVICE 173" packet
> > in the file.
> >
> > Anyone know what this means and if myth can be hacked to make use of
> > it?
> I haven't seen anything like this with RCN, but this is probably your
> listings/guide channel. The Cable box tunes to that to populate it's
> EPG, so it doesn't have to channel hop like we need to do to get ATSC
> EPG data. It could be reverse engineered to provide the same data for
> MythTV. Though there is probably already a standards document for it,
> as this isn't top secret information or anything.
> -- Daniel
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