[pulseaudio-discuss] Toslink capture looback latency problem

NicoHood pulseaudio-discuss at nicohood.de
Mon Jan 29 13:44:07 UTC 2018

On 01/29/2018 01:39 PM, Georg Chini wrote:
> On 29.01.2018 12:52, Nico wrote:
>> Hi,
>> I want to capture the audio stream of my TV with my PCI-E Toslink sound
>> card and play it back on my usb XLR soundcard. The reason why I do that
>> is to use my own music boxes rather than the TV speakers. With toslink +
>> XLR I do not have problems with ground loops etc.
>> I am using the pulseaudio loopback module with its default
>> configuration. The problem is, that the delay between picture and sound
>> is about one second off, and the longer I wait, the more delay it gets
>> (30 seconds and more). It is no usable like this.
>> I tried to play with the latencies of source, sink and the tv delay
>> itself without sucess. I also tried streaming with pacat directly as
>> described here:
>> https://thelinuxexperiment.com/fix-pulseaudio-loopback-delay/
>> I also tried to change different parameters of the loopback module or
>> the sources/sinks, but that did not help. I never changed any global
>> pulseaudio config to avoid larger configuration issues. The CPU usage of
>> pulseaudio is at 3% with the loopback module
>> Can anyone help me to get rid of this lag?
> Hi Nico,
> which version of PA are you using? Can you provide logs?
> Regards
>              Georg

Hi Georg,
oh sure I completely forgot:

pulseaudio 11.1-1 (Arch Linux)
uname -a: Linux zebes 4.14.15-1-ARCH #1 SMP PREEMPT Tue Jan 23 21:49:25
UTC 2018 x86_64 GNU/Linux

Here is a logfile:
LANG=C pulseaudio -vvvv --log-time=1 > ~/pulseverbose.log 2>&1


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