[mythtv-users] Loss of Service Recognition -- Nifty!

[Sasha Z]

ATSC is a digital thing and so myth has the ability to detect if
there's something there.

However, ivtv cards have the signal detected flag, and it can tell
when the cable is disconnected. It would be swanky if myth checked
that to know if the tuner was actually receiving something.

Alternatively, you could take a key frame histogram of the recorded
file and you should be able to see if it's just white noise.

On 3/17/06, White Joe <joe.white at consultant.volvo.com> wrote:
>
>
> > -----Original Message-----
> > From: mythtv-users-bounces at mythtv.org
> > [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Michael T. Dean
> > Sent: Thursday, March 16, 2006 6:28 PM
> > To: Discussion about mythtv
> > Subject: Re: [mythtv-users] Loss of Service Recognition -- Nifty!
> >
> > On 03/16/2006 10:05 AM, White Joe wrote:
> >
> > >The power jumped the other night when we were recording The
> > Shield and
> > >The Closer.  Unfortunately (foolishly), we don't have a UPS
> > on the Myth
> > >box.  Fortunately, I was sitting right there and turned the machine
> > >right back on.  When it came back up I noticed something interesting.
> > >The recording of The Closer restarted as soon as the BE
> > restarted, but
> > >the recording of the Shield was marked as "A" for aborted, and
> > >rescheduled for a later showing that night.  We have had power
> > >interruptions before, under similar situations, under .18, and I have
> > >never noticed that behavior before.  Is that a .19 feature?
> > Very nifty.
> > >
> > >
> >
> > Yeah.  Pretty much.  Myth 0.19 stores info about what happens with
> > recordings so it can take appropriate action.
> >
> > http://www.gossamer-threads.com/lists/mythtv/users/156425#156425
> > http://www.gossamer-threads.com/lists/mythtv/dev/173865#173865
> >
> > >Does Myth also exhibit the same behavior when the cable or satellite
> > >goes out?
> > >
> >
> > Nope.  Only when "Myth goes out."  ;)
> >
> > (To Myth, a 1-hour recordings of "Satellite Signal Not
> > Available" looks
> > right--and has no commercials!  Although, if you want that
> > show, let me
> > know--I've recorded it, so I could send you a copy.  For some reason,
> > though, Myth doesn't seem to detect duplicates for it. :)
> >
> > Mike
> > _______________________________________________
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> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
>
> What about with cable?  One of the setting menus has an item labled ATSC
> Signal Threshhold(?) or something similar.  Does the basic code exist to
> sense if a valid signal is being received?
>
> jw
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