Re: Shrill audio recording on Pixelview PlayTV MPEG-2 4900

[Cyrus Adkisson <lists@xxxxxxxxxxxxxxxxxx>]

I tried using the line-in jack rather than mic-in and it didn't seem to 
help. Also, I've noticed that the higher the frequency the channel I'm 
trying to record, the less pronounced the screeching noise becomes. For 
instance, Animal Planet at frequency 385.250 has hardly any noise at all 
while CSPAN2 at frequency 145.25 has a significant amount. Wonder why 
that would be?

And I know this question doesn't really belong here, but is there a way 
to record audio excluding frequencies above a certain level? (talking 
about audio frequency, here) That would give me a sloppy workaround at 
the very least.

Cyrus

Cyrus Adkisson wrote:

> Shad,
>
> Thanks for the response. I'm getting the audio problem with three 
> different types of audio devices: intel8x0, ens1371 and usb-audio. 
> I've got the output sound going into the mic-in jack of the audio 
> devices... I'll give it a try with the line-in, though, and see if 
> that helps any.
>
> I should also mention that I tried arecord as well as ffmpeg and got 
> the same shrill noise, so it is probably not recording program-dependant.
>
> Cyrus
>
> Shad Van Den Hul wrote:
>
> > Are you using the Audio out on the tv card to the line in on your 
> > sound card?
> >
> > I had a problem where I traced the problem back to crappy onboard
> > sound.  It just couldn't do a full duplex operation.
> >
> >
> > On Wed, 02 Feb 2005 13:36:21 -0500, Cyrus Adkisson
> > <lists@xxxxxxxxxxxxxxxxxx> wrote:
> >  
> >
> > > Cyrus Adkisson wrote:
> > >
> > >   
> > >
> > > > The card (mostly) works with modprobe.conf options:
> > > >
> > > > options bttv card=34 tuner=43
> > > > options tuner addr=0x61
> > > >
> > > > That is, it gives video and the audio sounds fine both directly out of
> > > > the device and through the onboard (alsa-powered) audio card. However,
> > > > I'm still getting high-pitched, staticy, shrill audio when trying to
> > > > record an MPEG-4 file with ffmpeg. I'm using this same ffmpeg version
> > > > on various other computers and bttv card models without trouble. If
> > > > someone has any suggestions or comments, I would greatly appreciate 
> > > > them.
> > > >
> > > > Cyrus
> > > >
> > > > --
> > > >
> > > > Unsubscribe
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> > > > https://www.redhat.com/mailman/listinfo/video4linux-list
> > > >
> > > >
> > > >
> > > >     
> > >
> > > Additional information:
> > >
> > > The shrill audio seems to be uniform no matter what video format it is
> > > encoded in. I have recorded a couple of 3-5 second segments of video 
> > > you
> > > can get here:
> > >
> > > http://hq.dynalias.com/outfile0.avi
> > > http://hq.dynalias.com/outfile0.mpg
> > >
> > > Thought they might be useful in helping to diagnose what is going on.
> > >
> > > Cyrus
> > >
> > > --
> > >
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> > > https://www.redhat.com/mailman/listinfo/video4linux-list
> > >
> > >   
> >
> >
> >
> >  
>
> --
>
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