[mythtv-users] Distorted sound on TNT, Game Show Network

[Jerry Rubinow]

On Fri, Jul 11, 2008 at 10:02 PM, Jim Miller <mythgroups at castinghobby.com>
wrote:

> Jerry Rubinow wrote:
> > I've noticed that when playing back (at least some) shows recorded
> > from TNT (e.g. Law & Order, Cold Case) and Game Show Network the sound
> > is distorted, sounding as if it's overmodulated.  I'm not sure how
> > recently it started.  I'm recording using a PVR-500 via s-video +
> > analog sound inputs.  Source is verizon FIOS, digital tier of
> > channels.  Recording from USA, another channel in the same range
> > yields normal sound.  It is going through the exact same Myth input.
> > I'm using 0.21-fixes.
> >
> > I've tried messing around with the configuration settings on the
> > General sound page.  I tried changing the dsp, AC3 passthrough,
> > aggressive sound buffering, and a couple of other settings, but
> > nothing seems to affect the problem (although, of course, certain
> > settings cause me to get no sound at all).
> >
> > Any suggestions?
> >
> > Thanks,
> > Jerry
> > ------------------------------------------------------------------------
> >
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> >
> I've had similar problems in the past with PVR-500's.  For me the
> problem was firmware related.  With certain IVTV firmware's when used
> with certain revisions of the PVR-150/500 cards the sound would get the
> overmodulated sound that you describe.  It would not go away with a
> reboot.  Resetting the firmare required a shutdown, leave power off for
> at least 30 seconds to clear the cards registers, then power back on.
> I'm not very familiar with FIOS, but I assume with FIOS you have a set
> top box that you are feeding into one or more of the s-video input(s) of
> the PVR-500? Are you feeding two STB's into the PVR-500? Are the
> distorted recordings all being recorded with one of the "tuners",  with
> the clear recordings being recorded by the other? If you are only using
> one input then it is unlikely to be the firmware issue, but if it is
> related to one of the tuners and not the other (not really channel
> specific but input specific) then I suspect that it is firmware related.
> -Jim
>

Jim, I tried to reply to your private message the other day, but it
bounced.  Here's what I said:

Thanks for the reply Jim, and for the info.  Yes, you guessed correctly - I
have a STB whose s-video out feeds into the PVR-500.  The coax inputs on the
PVR receive straight analog from the raw coax (well not anymore, since
Verizon turned off their analog distribution about two weeks ago).  The
s-video is only going thru the same one tuner always.  But some of the
channels were being recorded fine by that same tuner, while other were
sounding overmodulated.  I don't know if the second tuner exhibits the same
problem.

I just got a new piece of data though.  My wife just decided to inform me
that the Game Show Network was no longer overmodulating earlier today.  I
don't know if TNT is - the tv's off for the evening already.  I'll have to
check it out tomorrow.  Potentially it was a Verizon issue.

----------------------

Since I wrote that, today TNT is not having the problem anymore, so I have
to assume it was a problem with the provider, since I haven't rebooted or
restarted Myth or changed any setup options since then.

-Jerry
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