On Wed, Mar 21, 2007 at 09:58:06PM +0100, Hans Verkuil wrote:
> On Wednesday 21 March 2007 20:49, David A. De Graaf wrote:
> > There seems to be a bad interaction between ivtv and the system
> > clock. After much experimentation, I've found that both ivtv-0.10.0
> > and ivtv-0.10.1 have this problem, but ivtv-0.8.1 does not.
> >
> > When mythtv records TV programs with my Hauppauge WinTV PVR 150, the
> > system clock runs slowly - so much that ntpd loses sync. When
> > recording ends the system clock resumes normal speed.
> >
> >
> > Eventually I realized that this behaviour began after I "upgraded" to
> > ivtv-0.10.0. When I revert to ivtv-0.8.1 the clock runs correctly.
> > When I install the latest ivtv-0.10.1, the problem returns.
> >
> > Here's my setup:
> > Athlon(tm) 64 Processor 3200+
> > Fedora Core 6, kernel-2.6.19-1.2911.fc6 x86_64
> > mythtv ver 0.20
> > ivtv-0.10.0
> > Hauppauge WinTV PVR 150, recording NTSC from cable
> > pcHDTV HD3000, recording broadcast ATSC digital TV
> >
>
> I strongly suspect what is wrong. A patch for this is in progress and
> I'll post a messages for people to test it when it is ready. Probably
> this weekend, in fact.
Hans, thank you for responding. I hope you can fix it. I want to be
the first to test your new code.
I had thought it would be OK to simply revert to ivtv-0.8.1, since
there is no clock disturbance with that version. However a recent yum
upgrade has installed kernel-2.6.20-1.2933.fc6 x86_64, and now
ivtv-0.8.1 won't compile. FWIW, ivtv-0.10.1 compiles perfectly, but
it still interferes with the system clock speed.
>
> I think that turning off any VBI support in MythTV might be sufficient
> to workaround the problem.
That advice may be correct, but it's too cryptic for me.
I suffer from AIS (Acronym Impairment Syndrome). :-)
I presume by VBI, you mean Vertical Blanking Interval, which is a
property of the video signal. During this portion of transmission,
the Closed Captioning signal is transmitted digitally, and there seems
to be code in ivtv and mythtv that captures that data.
I haven't found any means to "turn off VBI support", either as a
compilation option for mythtv, or as an option in any of the extensive
and bewildering configuration menus.
Can you please be a bit more explicit?
Thanks.
--
David A. De Graaf DATIX, Inc. Hendersonville, NC
[EMAIL PROTECTED] www.datix.us
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