[pulseaudio-discuss] remap-sink reproduces sound on more than the target channels

Matt Patterson matt at v8zman.com
Thu Jun 19 10:57:59 PDT 2008

Sometimes I just love open source. I know I probably should have been 
the one to prepare the patch, but I really do appreciate the 
responsiveness possible with stuff like this. I had a problem, I was 
helped through a workaround, and then it was fixed properly. Awesome!

Thanks Lennart.


Lennart Poettering wrote:
> On Thu, 12.06.08 20:53, Tanu Kaskinen (tanuk at iki.fi) wrote:
>> On Thu, Jun 12, 2008 at 08:36:16AM -0700, Matthew Patterson wrote:
>>> I have an update on this front. I downloaded a 8 channel wave file, and 
>>> when I play it via the 8 channel sink I get perfect channel seperation. 
>>> If I play the same file via one of the 2 channel sinks then I get the 
>>> sound reproduced on outputs other than what that sink is tied to BUT the 
>>> volumes are different making me think this is some kind of virtual 
>>> surround. Does ALSA or pulse have the ability to cause this, or is this 
>>> basically the sound card being annoying?
>> Pulseaudio semi-intelligently makes stereo streams surround
>> streams, if you have a surround sound card. Unfortunately
>> this affects the streams from the remap sinks too (I think
>> this will be fixed real soon now in svn, if Lennart approves
>> the new behaviour). Fortunately the feature can be disabled
>> in daemon.conf (disable-remixing).
> I have now commited patch that makes remixing optional for remap
> sinks, controllable with the remix= parameter to the module.
> Lennart
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