[Jack-Devel] Capture problems with jack2 on Axia-Alsa device

[Kjetil Matheussen]

On Wed, Jan 31, 2018 at 3:08 PM, Christian Affolter <
c.affolter at purplehaze.ch> wrote:

> On 31.01.2018 11:42, Kjetil Matheussen wrote:
> > On Wed, Jan 31, 2018 at 11:29 AM, Christian Affolter
> > <c.affolter at purplehaze.ch <mailto:c.affolter at purplehaze.ch>> wrote:
> >
> >
> >     Yes, it's a proprietary driver and I don't have access to the source
> >     code. I could contact the vendor and ask if they observed the same
> or a
> >     similar issue already.
> >     However, I'm wondering what arecord and jackd-dummy/alsa_in are doing
> >     different compared to jackd-alsa.
> >
> >
> > Sorry if this is not relevant (I'm not quite following what's
> > happening), but could
> > it be that the difference can be explained by different alsa paremeters
> set
> > by arecord and jack? Have you tried to run "arecord -L" and find the most
> > low-level device to record from (which jack probably uses).
> >
> > For instance by running something like "arecord -D
> iec958:CARD=M2496,DEV=0"
> > (my soundcard).
> >
> > If that is the case, then it's probably the default alsa device that
> > does something magic
> > when accessing a more low-level device.
>
> I ran both, arecord and jackd with hw:0 initially. I re-ran the capture
> again with "arecord -D default:CARD=Axia ...", which didn't make any
> difference (the recording sounds correct).
>
> For the record, here is the ALSA capture PCM and device list:
>
>
Maybe jack will work if you give it the same parameters that arecord uses.
I.e. compare
the content of  /proc/asound/card0/pcm0p/sub0/hw_params (or a similarly
named file)
when running arecord and when running jack.

Also, maybe it works to record in jack if you change audio from "duplex" to
"capture only".
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.linuxaudio.org/archives/jackaudio/attachments/20180131/cf037211/attachment.html>