[mythtv-users] HD-3000 recording corruption

Craig Partin cpartin at gmail.com
Tue Apr 4 01:09:07 UTC 2006


> > >>>>This is the first time I have been stumped in over two years of
> > >>>>mythtv
> > >>>>use.  I got my HD-3000 working just fine tuning QAM stations over
> > >>>>cable in myth.  The system works flawlessly and reliably except that
> > >>>>QAM recordings get trashed when anything else is happening on the
> > >>>>system.  It records beautifully when nothing else is happening.  This
> > >>>>happens on all channels, HD and SD.  I can playback 1080i content
> > >>>>with
> > >>>>XVMC just fine, even with bob.
> > >
> > >
> > > Sounds like interference getting into the HD-3000 from the video card.
> > > Try moving them farther apart, electrically shielding the card(s), and
> > > make sure if you have a jumper cable between the sound card and the HD-3000
> > > that it is either removed or has RFI protection (a couple of turns through
> > > a torroidal core at each end).
> > >
> > > Good Luck.
> > This was going to be my response too.
> > Since it is video related it has to be something the video card does,
> > either as an interference transmission or on the bus. Since it seems to
> > be size related I would not think it would be the bus. It is related to
> > the 'active' area of the screen.
> >
> > You might, just to see if that is what is going on, try putting
> > something between the 2 cards to shield them from each other. A piece of
> > aluminum plate, wrapped in cling wrap to avoid shorting things, would
> > do. Or for that matter a piece of alum foil between 2 sheets of paper.
> > Just remember to ground one corner of the shield to the case.
> >
> > Geoff
>
>
> My mobo has a communications PCI slot, and I put the HD-3000 there.
> It also has spread spectrum controls to reduce RFI.  I have switched
> slots and and toggled the RFI settings and noticed no change.
>
> I haven't done the exact test with the video card and signal strength
> but I cannot watch live TV or azap tune and watch in mplayer without
> corruption.
>

Watching Live tv from the HD-3000 and with mythcommflag running in the
background gives an iowait of ~2.0%.  Nothing else in top looks bad
nor out of the ordinary.   I don't think this is bus traffic problems.
 I'll break out the tinfoil this weekend and if shielding the card
doesn't work maybe I can make a nice hat.


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