lag between analog and digital outputs using module-combine-sink
Submitted by aso..@..il.com
Assigned to pul..@..op.org
Description
Setting up simultaneous analog and digital output results in relative lag between the analog and digital outputs on my Nforce2 motherboard with onboard sound.
This is using the example provided in the pulseaudio archlinux wiki, here:
https://wiki.archlinux.org/index.php/PulseAudio/Examples#Simultaneous_HDMI_and_Analog_Output
.. with the following "default.pa" entries:
Load analog device
load-module module-alsa-sink device=hw:0,2 load-module module-combine-sink sink_name=combined set-default-sink combined
I can be watching a movie on VLC and a relative delay between analog and digital outputs can develop, so that a sound will come out one set of speakers half a second after they come out the other, making movies unwatchable. A fast way to make the problem occur is to change tracks on Clementine, making use of the crossfade feature, resulting in an element of mixing. The relative lag is non-fixed and sporadic.
This problem does not occur using a custom .asoundrc to setup simultaneous digital and analog output using ALSA without Pulseaudio.