[pulseaudio-discuss] combined sink does not work with pulseaudio-dlna

Ivan Kanis pulseaudio at kanis.fr
Mon Feb 20 15:55:38 UTC 2017

Hi Tanu,

February, 16 at 12:50 Tanu Kaskinen wrote:

> On Wed, 2017-02-15 at 17:25 +0100, Ivan Kanis wrote:
>> The author of the dlna plugin has told me that the combined sink feature
>> is not implemented in his module. He has given me an alternative with
>> the loopback module:
>> load-module module-loopback sink=alsa_output.pci-0000_00_1b.0.analog-stereo
>> Then pickup the loopback on the Chromecast. It works but, as expected,
>> it is not in sync.
> So the source of the loopback is the monitor source of the chromecast sink?

No the source of the loopback is the alsa sound card. I tried to set it
to the Chromecast sink but I got silence then I got a noise that got
louder and louder. I am a little wary to try that again, I don't want to
break anything.

>> I am now looking for a way to delay the local playback but I can't
>> figure out how.
>> I tried latency_msec=3000 but it set's the latency on the Chromecast.
> If the source of the loopback is the monitor source of the chromecast
> sink, increasing the latency of the loopback module should increase the
> latency of what is played to the alsa sink, not the chromecast sink.
> It's a known problem that something is wrong in module-loopback related
> to the latency_msec paramter:
> https://bugs.freedesktop.org/show_bug.cgi?id=80770
> The loopback patches that Georg Chini submitted recently probably fix
> the latency_msec parameter behaviour.

The latency is working. Before I route the loopback to the Chromecast I
can hear an echo on the local sound card. I need to somehow delay the
local playback but that's where the loopback is being picked up from. A
chicken and egg problem?

I don't think it's worth spending much energy fixing this.

Have a nice evening,


I have a dream that one day on the red hills of Georgia the sons of
former slaves and the sons of former slave owners will be able to sit
down together at the table of brotherhood.
    -- Martin Luther King

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