[pulseaudio-discuss] Loopback Delays

Daniel windseeker at gmx.de
Mon Mar 3 09:57:43 PST 2014

(AFAIK) on a PC the player queries the audio latency from pulseaudio and
then delays the video for the same amount to have it in sync. Obviously,
having whatever player on another device as the pulseaudio daemon does not
grant that option.

I hope that Tanu's hint with the module argument can ease the problem, but
for sure it cannot solve it completely. For solving the problem (without
having the chance of delaying the video), you would need to get 0ms
latency. I guess that's impossible, as the audio driver below pulseaudio
(alsa et al) has buffers to serve, too.

2014-03-03 18:03 GMT+01:00 Tanu Kaskinen <tanu.kaskinen at linux.intel.com>:

> On Mon, 2014-03-03 at 08:30 -0800, James Board wrote:
> > > I use my Linux PC to play audio from
> > > my DVR to my PC speakers.  So, the DVR audio output is
> > > connected to the audio input of the PC.  The audio
> > > output of the PC is connected to the PC speakers.  In
> > > pulseaudio, I load the loopback module (I don't remember the
> > > exact terminology) to route the audio from PC input to PC
> > > output.  It's fairly simple.
> > >
> > > The problem is that this introduces a 0.5 second delay in
> > > the audio.  The sounds being played through the PC
> > > speakers occur 0.5 seconds after the video.  Very
> > > noticeable.  How can I eliminate, or reduce this
> > > delay?
> >
> > There were no responses to my question.  Did I explain
> > poorly?  Or maybe this was a dumb question?  Or,
> > is it not possible to reduce this delay?
> No, it's not a dumb question, it's just that people don't always have
> time to answer all questions (or they may answer the questions after
> several days).
> You can try to play with the "latency_msec" argument of module-loopback.
> If that doesn't work, then you have to introduce delay in the video
> output. If that's not possible, then you're out of luck.
> --
> Tanu
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