[mythtv] LiveTV playback timing problems
Paul Sykes
pdsykes at gmail.com
Sat Nov 27 13:41:14 UTC 2004
Hi,
On Sat, 27 Nov 2004 10:07:26 +0000, Ed Wildgoose <lists at wildgooses.com> wrote:
>
>
>
> And was that the problem? Just find out for goodness sake?! I am entirely
> new to linux and I do not know how to change the sample rate of my sound
> card. I was hoping that somebody would tell me through this list
> You don't (and usually can't) set the sample rate of your soundcard. The
> programmer requests the rate that they want and the card usually gives it to
> them. Sometimes if you have a digital receiver, then the output gets stuck
> at 48Khz because that's all the card designers felt like implementing for
> spdif. Ocassionally (much more rare I think), the card gets locked in the
> same way at 44Khz.
>
> Suprisingly, from the angle I am sitting here I can't quite see which sound
> card you even have....
>
Ok, I have managed to use /proc/asound to show that the soundcard is
receiving and playing a 48khz signal so I do not think it is related
to that.
My soundcard, as I said in my last e-mail, is a C-Meida CMI 8738 PCI
(onboard) soundacard. I have also tried a usb sp/dif soundcard that I
have and exactly the same thing happens.
I do not think that this is a problem related to sound/video hardware,
I think that it is something to do with the linux timing services,
like the RTC.
>
> I am using an LCD monitor and the refresh rate is set to 75hz, it is also
> connect via DVI rather than a standard VGA connector. Could this be a
> problem.
> It could be. Try changing the refresh rate to 50Hz. You will probably
> need to generate a new modeline (there is some X app that I forget the name
> of which does it automatically).
I have now tried this and the problem still persists.
> Try also checking your myth options in the tv playback settings menu.
> Stuff like "use video as timebase" is not going to work here.
>
> Sounds wierd. You really do need to try to provide more info to get this
> debugged though
The reason why I approached this list was to get some help, I have
given you all of the information that you have asked for and I am not
entirely sure what else might be helpful. I have given you a complete
list of my hardware, the version of myth I have installed, and I have
now tried every version from 0.15-r1 to the current cvs.
Still I have had no answer as to what MythTV uses as it's timer
source, is there a developer out there who could tell me? Is the
source different for the video/sound and the video position timer?
> Good luck
>
> Ed W
>
Thanks for your help so far.
Paul
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