[Jack-Devel] Does alsa_in reading from SPDIF input inject pops and clicks?

crocket crockabiscuit at gmail.com
Fri Aug 9 01:46:27 CEST 2019


* Does clock source matter if alsa_in resamples every audio sample to jack
server's clock? Is it impossible to extract audio sample without knowing
clock?
* How can I have my computer automatically switch clock source between
SPDIF and internal? Is there a clock source named "SPDIF or internal"?

On Fri, Aug 9, 2019 at 7:21 AM Chris Caudle <chris at chriscaudle.org> wrote:

> On Thu, August 8, 2019 5:10 pm, crocket wrote:
> > Does changing clock source to internal clock or SPDIF make any difference
> > on pops and clicks?
>
> Your clock setting has to be consistent with the audio data flow.  If you
> are sourcing audio data from S/PDIF input and set the clock source to
> internal you will definitely get pops and clicks.  Internal clock should
> only be used when audio input is through the converters on the interface,
> or if you are only using S/PDIF for output.  The clock source should only
> be set to S/PDIF if you have a valid S/PDIF data stream present, and you
> should also verify that the sample rate you set for the interface matches
> the actual rate of the S/PDIF data.
>
> --
> Chris Caudle
>
>
>
>
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>
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