Stereo Mixer Static...sometimes.
Stereo Mixer Static...sometimes.
- Subject: Stereo Mixer Static...sometimes.
- From: Dominic Feira <email@hidden>
- Date: Sun, 14 Nov 2004 00:54:02 -0500
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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