[LAU] Multi-channel (3 or more) audio playback with alsaplayer

Giso Grimm gg3137 at vegri.net
Tue Dec 14 12:14:46 CET 2021

Dear Kamil,

On 14.12.21 11:43, Kamil Adiloglu wrote:
> Dear group,
> I would like to use alsaplayer via jack to play 3-channel audio files.
> These audio files will be routed into a real-time capable signal
> processing platform the open master hearing aid (openMHA). However, I
> cannot route the third channel to jack. I try to start alsaplayer as a
> daemon with the following command
> alsaplayer -i daemon -s PHL -o jack -d MHA:in_1,MHA:in_2,MHA:in_3 -F 16000

for this use case I would like to suggest to use a native jack command
line player. There are several options available, e.g., jackplayrec or
tascar_jackio (both published by the same company as openMHA), or
jack-play from jacktools.

Example with tascar_jackio:

tascar_jackio soundfile.wav MHA:in_{1,2,3}

(the {1,2,3} is shell expansion, you might to write it explicitly).

Best regards,


> However alsaplayer returns and error saying
> cannot connect output port 2 (MHA:in_2,MHA:in_3)
> Actually MHA:in_2 should be the output port 2 and MHA:in_3 is ment to be
> the output port 3.
> I first start the openMHA software so that it establishes 4 input and 4
> output connections via jack with the sound hardware. I can see the
> connections on qjackctl connections window.
> I have a sound card that has 8 input and output channels and the openMHA
> is configured to expect 4 input channels and produces 2 output channels
> and already mentioned. So, the problem is neither on the MHA side nor on
> the hardware. I am afraid that I cannot configure the alsaplayer
> correctly that it expects three (or more) output ports. I would
> appreciate any help from your side. Thank you in advance.
> Best regards,
> Kamil
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