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

[Thomas Brand]

On Tue, January 30, 2018 16:23, Christian Affolter wrote:
> Hi Thomas,
>
>>> Yes, but unfortunately it's a virtual device running on a headless
>>> server without any speakers attached. The playout would go into the
>>> Livewire+ network where I would have to re-capture it from another
>>> system.

If you try that it will help to rule out to be an issue of any jack client.

>>
>> you can try to run jack with --verbose, maybe it gives another hint.
>
> I did that already, see the pastbin links below:
>
>
>>>>>> # Starting jackd
>>>>>> # Verbose output at: https://pastebin.com/YzHEGSnR
>>>>>> jackd -d alsa -d hw:0
>
>>>>>>> # Capture via jackrec
>>>>>>> # This results in a too high pitched WAV file
>>>>>>> # Verbose output at: https://pastebin.com/PCnymKLA
>>>>>>>

this looks normal so far ..

>
>
>
>> you can run jack_bufsize to be absolutely sure it runs at the correct
>> SR.
>>
>
> jack_bufsize buffer size = 1024  sample rate = 48000
>

as expected ..


>> the alsa device could be the issue. you could try to start a dummy jack
>>  and add the alsa device with alsa_in to see if it makes a difference.
>> also make sure that you use a vanilla jack (git clone
>> https://github.com/jackaudio/jack2/) to rule out any other side-effect.
>>
>
> OK, I will compile from source later an re-run the captures.
>
>
>
> Thanks again
> Chris
>