Mailing List Archive: Jerky sound and another minor issue

Hi,

Thanks for the help - I finally managed to get mythTV working.

MythTV looks good but I still have 2 problems/annoyances which might or may not be related:
1) When I start mythfrontend for the first time and select live TV I get picture but no sound. If I change channel sound comes up and works fine thereafter. I also get mythfrontend warnings that /dev/dsp is not at full duplex but this is due to nforce drivers and as far as I understand does not matter with PVR250 anyway since audio is encoded by it.
2) Occasionally I get some jerky audio which is sort of annoying and I would like to fix it. I checked DMA settings on my HDs and it's on. What else can cause this problem?

Here are some of my HW specs:
Shuttle NVidia mobo with nforce drivers (OSS audio)
Athlon XP 2000+
PVR250
GeForce4 MX with TV out
512 Meg RAM

CPU utilization when watching live TV ~15%
DMA is enabled

Any hints/pointers will be appreciated. Once fixed I'll share my findings.

Thanks,
Lev

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Try running:

/usr/local/bin/test_ioctl -v input=7,output=1; sleep 3
/usr/local/bin/test_ioctl -v input=1,output=1

before starting up mythtv for the first time. I have to do this to get sound.

--------------------------------------------------------------
James S. White GAPS Incorporated
james@jameswhite.org Electrical Engineer - Etc.
http://www.jameswhite.org Caffeine is my anti-drug.
--------------------------------------------------------------
I can picture in my mind a world without war, a world without hate.
And I can picture us attacking that world, because they'd never expect it.
-Jack Handy

On Tue, 29 Jul 2003, Lev Pertsov wrote:

> Hi,
>
> Thanks for the help - I finally managed to get mythTV working.
>
> MythTV looks good but I still have 2 problems/annoyances which might or may not be related:
> 1) When I start mythfrontend for the first time and select live TV I get picture but no sound. If I change channel sound comes up and works fine thereafter. I also get mythfrontend warnings that /dev/dsp is not at full duplex but this is due to nforce drivers and as far as I understand does not matter with PVR250 anyway since audio is encoded by it.
> 2) Occasionally I get some jerky audio which is sort of annoying and I would like to fix it. I checked DMA settings on my HDs and it's on. What else can cause this problem?
>
> Here are some of my HW specs:
> Shuttle NVidia mobo with nforce drivers (OSS audio)
> Athlon XP 2000+
> PVR250
> GeForce4 MX with TV out
> 512 Meg RAM
>
> CPU utilization when watching live TV ~15%
> DMA is enabled
>
> Any hints/pointers will be appreciated. Once fixed I'll share my findings.
>
> Thanks,
> Lev
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@snowman.net
> http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
>