Re: Multichannel audio playback
didier gaumet <didier.gaumet@gmail.com> writes:
> Le 28/04/2021 à 09:37, Rodolfo Medina a écrit :
> [...]
>> First of all, problem 1): same error now with a 2-channel and a 3-channel
>> file:
> [...]
>> ERROR: Connecting chainsetup failed: "Enabling chainsetup: AUDIOIO-ALSA:
>> ... Channel count 2 is out of range!"
> [...]
>
> http://nosignal.fi/ecasound/Documentation/examples.html#multichannel
>
> I do not use ecasound but it seems to me that this indicates that by default
> ecasound is in a one channel (mono, channel #1) mode and that channels have
> to be specified with -a, perhaps like this:
>
> $ ecasound -a:1,2,3 -i:sndfile,3canali.wav -o alsahw,2,0
> or perhaps
> $ ecasound -a:all -i:sndfile,3canali.wav -o alsahw,2,0
Thanks, Didier:
it seems to work with 2 channels:
$ ecasound -a:1,2 -i:sndfile,2canali.wav -o alsahw,2,0
**************************************************************************
* ecasound v2.9.1 (C) 1997-2014 Kai Vehmanen and others
**************************************************************************
(eca-chainsetup) Chainsetup "untitled-chainsetup"
(eca-chainsetup) NOTE: Real-time configuration, but insufficient privileges
... to utilize real-time scheduling (SCHED_FIFO). With small buffersizes,
... this may cause audible glitches during processing.
(eca-chainsetup) "rt" buffering mode selected.
(audioio_sndfile) Using libsndfile to open file "2canali.wav" for reading.
(eca-chainsetup) NOTE: using existing audio parameters -f:s16_le,2,48000
... for object 'sndfile' (tried to open with -f:s16_le,2,44100).
(eca-chainsetup) Opened input "sndfile", mode "read". Format: s16_le,
... channels 2, srate 48000, interleaved (locked params).
(eca-chainsetup) Opened output "alsahw", mode "write". Format: s16_le,
... channels 2, srate 48000, interleaved.
- [ Connected chainsetup: "untitled-chainsetup" ] ------------------------
- [ Controller/Starting batch processing ] -------------------------------
- [ Engine - Driver start ] ----------------------------------------------
- [ Engine - Processing finished ] ---------------------------------------
- [ Controller/Batch processing finished (0) ] ---------------------------
- [ Controller/Processing stopped (cond) ] -------------------------------
- [ Engine exiting ] -----------------------------------------------------
(eca-control-objects) Disconnecting chainsetup: "untitled-chainsetup".
but not with 3:
$ ecasound -a:1,2,3 -i:sndfile,3canali.wav -o alsahw,2,0
**************************************************************************
* ecasound v2.9.1 (C) 1997-2014 Kai Vehmanen and others
**************************************************************************
(eca-chainsetup) Chainsetup "untitled-chainsetup"
(eca-chainsetup) NOTE: Real-time configuration, but insufficient privileges
... to utilize real-time scheduling (SCHED_FIFO). With small buffersizes,
... this may cause audible glitches during processing.
(eca-chainsetup) "rt" buffering mode selected.
(audioio_sndfile) Using libsndfile to open file "3canali.wav" for reading.
(eca-chainsetup) NOTE: using existing audio parameters -f:s16_le,3,48000
... for object 'sndfile' (tried to open with -f:s16_le,2,44100).
(eca-chainsetup) Opened input "sndfile", mode "read". Format: s16_le,
... channels 3, srate 48000, interleaved (locked params).
ERROR: Connecting chainsetup failed: "Enabling chainsetup: AUDIOIO-ALSA:
... Channel count 2 is out of range!"
Please help...
Rodolfo
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