[mythtv-users] Glitches in firewire capture from DCT-6200

Steve Adeff adeffs at gmail.com
Sat Dec 17 18:30:42 EST 2005


On Friday 16 December 2005 22:30, Azmat wrote:
> I've been using this script in a cron job for the last week, but I'm
> still seeing glitching.  Its mostly occurring at the start of a show
> and then clears up in the middle.  Is it possible that I might need to
> use a faster processor or bump up my RAM?  Right now I'm running an
> Athlon XP 2400+ with 1G of RAM.  Thanks in advance for the help.
>
> Azmat
>
> On 12/9/05, Steve Adeff <adeffs at gmail.com> wrote:
> > there was a thread a while back regarding this. You can search on
> > Gossamer for more info. basically you want to run this bash script. It
> > will set the p2p or broadcast connection to 1 depending on what your
> > machine will use. From what I've found bcast is prefered when available,
> > which is why it comes second (since its one or the other) p2p is
> > sometimes only available and when this is the case its fine. data_rate
> > doesn't need to be 3, but it increases speed if your using firewire for
> > capture and not just channel changing. I have it run before mythbackend
> > starts when I run it via init.d and I've found it resets sometimes so I
> > run it hourly as a cron job.
> >
> > oh, and the -n # is which node it is. In case you have more than one
> > firewire connection have it run for each connection as well.
> >
> > #!/bin/bash
> > plugctl -n 2 opcr[0].channel=63
> > plugctl -n 2 opcr[0].n_p2p_connections=1
> > plugctl -n 2 opcr[0].bcast_connection=1
> > plugctl -n 2 opcr[0].data_rate=3
> >
> > --
> > Steve
> >
> > On Friday 09 December 2005 14:52, Azmat wrote:
> > > Here's my plugreport output:
> > > Host Adapter 0
> > > ==============
> > >
> > > Node 0 GUID 0x0000d10080357942
> > > ------------------------------
> > > libiec61883 error: error reading oMPR
> > > libiec61883 error: error reading iMPR
> > >
> > > Node 1 GUID 0x4279358080357942
> > > ------------------------------
> > > libiec61883 error: error reading oMPR
> > > libiec61883 error: error reading iMPR
> > >
> > > Node 2 GUID 0x000f9ffffe103008
> > > ------------------------------
> > > oMPR n_plugs=1, data_rate=2, bcast_channel=63
> > > oPCR[0] online=1, bcast_connection=0, n_p2p_connections=0
> > >         channel=63, data_rate=0, overhead_id=0, payload=376
> > > iMPR n_plugs=0, data_rate=2
> > >
> > > On 12/9/05, Steve Adeff <adeffs at gmail.com> wrote:
> > > > On Friday 09 December 2005 12:44, Azmat wrote:
> > > > > Hi,
> > > > >
> > > > > My mythtv system is running on an AMD Athlon XP 2400+ (2 GHz) with
> > > > > 1G RAM, a PVR-350 and firewire capture from my Motorola DCT-6200
> > > > > cable box.  Whenever I do firewire capture from the box through
> > > > > Myth, the recording exhibits a audio/video glitching.  The picture
> > > > > will momentarily become pixelated and there will be a brief skip. 
> > > > > I can tell the glitch is in the recording because when I rewind and
> > > > > playback it is reproducible.  There is no pattern or regularity to
> > > > > the glitching.  Sometimes it will be at the start of the show and
> > > > > will disappear in the middle, only to reappear later.  It doesn't
> > > > > prevent me from recording shows, but is just become a huge
> > > > > annoyance that I'd like to take care of.  Does anyone have any idea
> > > > > what might be wrong? Do you think a faster processor would help?
> > > > >
> > > > > Thanks in advance,
> > > > >
> > > > > Azmat
> > > >
> > > > run plugreport and paste the output.
> > > >
> > > > --
> > > > Steve
> > >
> > > --
> > >
> > >
> > > Azmat
>
> --
>
>
> Azmat


What speed setting do you have set for the firewire capture device? try 
increasing it as Myth will change these plug values when you use firewire as 
a capture device.

Steve


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