nick.rout at gmail
Aug 3, 2012, 12:52 AM
Post #2 of 2
(287 views)
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Re: PVR-150 / PVR-250 audio distortion bug workaround
[In reply to]
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On Fri, Aug 3, 2012 at 7:03 PM, Stephen Worthington
<stephen_agent [at] jsw> wrote:
> I record from my Sky decoder using the S-Video input on a Hauppauge
> PVR-250 card. My mother records FM radio using a PVR-150's FM tuner
> on her MythTV box. Both of us get recordings fairly frequently where
> the audio suffers from nasty distortion - the real audio is there, but
> mixed with other nasty sounds that usually make it impossible to
> listen to the recordings where it happens. Today I discovered this
> page:
>
> http://urlgrey.net/?p=231
>
> which has a workaround that seem to work. What it does is to wait
> until the recording has started, then issue a command to the card to
> select audio input 1. I tried this on my mother's box, and on the
> second try at using live TV to listen to FM, I got the distorted
> audio. Then I manually issued the command, and the distortion went
> away.
>
> What I think may be happening is that more than one audio input is
> being routed into the audio output, so you get the wanted audio plus
> noise from an audio input that is not connected to anything. The
> workaround re-selects just the wanted input.
>
> So now I am off to update both our tuning scripts to automate the
> workaround by forking off a script to issue the command. I am going
> to use a "sleep 10" so that there will be some distortion at the
> beginning of recordings if the bug occurs, and I will then be able to
> tell if the fix works.
Yes similarly documented years ago, usually easiest found by searching
on "tinny audio pvr-150"
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