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Re: Stereo Mixer Static...sometimes.
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Re: Stereo Mixer Static...sometimes.


  • Subject: Re: Stereo Mixer Static...sometimes.
  • From: William Stewart <email@hidden>
  • Date: Mon, 15 Nov 2004 10:52:27 -0800

If you could file a bug report with code to reproduce it at
http://bugreporter.apple.com we'd be happy to look at this

Bill

On 13/11/04 9:54 PM, "Dominic Feira" <email@hidden> wrote:

> Hello.
>
> I have an AUGraph set up that looks like this:
> This graph is not run in real-time, I am using AudioUnitRender to pump
> it manually.
>
> [AUConverter] -----
>                                     [Stereo Mixer] ------ [Converter]
> ---------  [Quicktime or LAME] ------- [ File ]
> [AUConverter] -----
>
> Quicktime or LAME and File obviously aren't part of the graph.
>
> Here's the part that is boggling my mind:
>
> If I use LAME to encode everything works perfectly, I end up with a
> perfectly mixed mp3, it sounds great!
>
> If I use Quicktime, I end up with static in my audio.  I have
> determined that the fault lies with the mixer.  If I set one of the
> input levels on the mixer to 0.0 then there aren't any pops or crackles
> in the audio.  This leads me to conclude that the mixer is introducing
> the static.
>
> The only difference that I can find that could possibly introduce the
> static is that using Quicktime for encoding is more CPU intensive that
> LAME.  This doesn't seem like it should matter though, because I am
> pumping the graph manually.  Does anybody have any ideas?  I wish I had
> a more specific question, but I am stumped.
>
> Dominic Feira / Code Monkey / Ambrosia Software, Inc.
>
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References: 
 >Stereo Mixer Static...sometimes. (From: Dominic Feira <email@hidden>)

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