[Csnd] Audio output error,...

The Csound Mailinglist
1

Dear Group,

First, happy holidays!

MacBook Pro 10.15.7 OS,
using CsoundQt-d-html-cs6, ver 0.9.8.1, 6162 for 64bit.

Projects worked fine a few days ago. Haven’t changed any setting on the computer or Csound.
No output from the headphone jack.

Error coming up on projects that worked fine a few days ago and now comes up with output error. Mac is good, Peterson picks up tone from other sources, headphones are fine with other sources.

Points to something in Csound, don’t know what it is, at a loss.

Thanks all,
-Partev

When I render, this is what come out on the sidebar,….

STARTING FILE
Creating options
Creating orchestra
closing tag
Creating score
rtaudio: PortAudio module enabled …
using callback interface
Elapsed time at end of orchestra compile: real: 0.005s, CPU: 0.005s
sorting score …
… done
Elapsed time at end of score sort: real: 0.005s, CPU: 0.005s
midi channel 1 using instr 3206
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displays suppressed
0dBFS level = 1.0
orch now loaded
audio buffered in 1024 sample-frame blocks
reading 4096-byte blks of shorts from adc (RAW)
PortAudio V19.7.0-devel, revision 147dd722548358763a8b649b3e4b41dfffbcfbb6
0: adc0 (MacBook Pro Microphone [Core Audio, 1 in, 0 out])
PortAudio: selected input device ‘MacBook Pro Microphone’
0: dac0 (External Headphones [Core Audio, 0 in, 2 out])
1: dac1 (MacBook Pro Speakers [Core Audio, 0 in, 2 out])
PortAudio: selected output device ‘External Headphones’
*** PortAudio: error: -9998: Invalid number of channels
closing device
Failed to initialise real time audio output

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2

Hi Partev
It looks like your audio input device has only one channel, while the output has two. IIRC there is a flag that can set the number of channels for in and out separately. Something like nchnls_input=1 or similar. Then it should work.
Unable to test now, sorry abut that.
All best
Øyvind

3

I’ll try that. Thanks.
Happy holidays.

-Partev

4

That didn’t do it, just gave me syntax error for something else. Have to
rethink this now.

Hmmm,… maybe time to bump up to that new version of Csound.

Thanks,
-Partev

5

Its nchnls_i =1 as far as I remember

6

yes and this nasty error is related to a change in mac os which set the internal mic to mono rather than stereo. this caused a problem in portaudio.

if the new version does not help, nor the nchnls_i = 1:
- set real time input to none.
- choose another RT audio module (coreaudio should be fine, jackosx is best in my opinion).

best -
  joachim