[mythtv-users] Buzzing for analog MPEG2 audio

[Dwight Morgan]

Well, if you figure it out let me know, I have the same problem and just assumed it was a ground loop.  I have another one in my system that is subtle, but the one coming out of the PVR350 is NOT.  I haven't had time to check into it.  Too busy trying to get the basics working.

-Dwight

>>> On 09/26/2006 at 21:11, in message <1159330315.11925.3.camel at localhost.localdomain>, Kevin Mori<kmori.nospam at gmail.com> wrote:

Dwight,
Thanks for the suggestion.  Unfortunately, it's not really a subtle hum
and like I may have mentioned, it's only with MPEG2 and only with Myth.
I thought maybe it's an interrupt sharing problem but nothing is shared
right now.  I've also tried different kernels.  I may try to do a Myth
build in debug mode and see if I can see any errors in the log.

On Tue, 2006-09-26 at 16:28 -0700, Dwight Morgan wrote:
> HTML document attachment (Text.htm)
> If you are running it into a stereo system I would guess a ground
> loop.  Try running the output into a smaller system or unplugging the
> coax from the wall.  I have hum that I need to get rid of all the
> time, but from the PVR350 it is worst. I was assuming that was the
> problem.  I am planning on getting a ground isolator for the cable,
> and already have one installed in the midst of my amplifiers due to
> another one.
>  
> -Dwight
> 
> >>> On 09/26/2006 at 15:23, in message
> <33549.143.182.124.2.1159309420.squirrel at mori.homelinux.com>, Kevin
> Mori<kmori.nospam at gmail.com> wrote:
> 
> New problem I found on 2 systems here.  Normally, I run a
> mythtfrontend
> with SPDIF out with alsa.  It's fine.  I've moved one setup and now I
> need
> to use the analog audio stereo output.  I can watch MPEG4 recordings
> fine
> with Myth but MPEG2 ATSC livetv and recordings have nothing but a
> constant
> buzzing noise.  I can watch these same recordings from xine and they
> sound
> fine.
> 
> I'm using 0.20 release.  One system is using the latest release for
> alsa
> with snd_hda_intel.
> 
> Anyone have any ideas?
> 
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