[pulseaudio-discuss] Pulseaudio Delay with Mythtv

[Mark Greenwood]

On Saturday 18 Apr 2009 16:20:40 Ken Mandelberg wrote:
> Recently the trunk build of Mythtv checks if pulseaudio is running and 
> aborts if it does. This is because of the rather large audio delay it 
> induces and the resulting sync with video issue.
> 
> Here is the reference
> 
> http://svn.mythtv.org/trac/ticket/5473
> 
> particularly:
> 
> 
>   Changed 3 months ago by sPOiDar  ¶
> 
> FYI, I get ~300ms lag on 0.22 with audiooutpulse-0.12.2 when using pulse.
> 
>   Changed 13 days ago by danielk ¶

This must be something that has been recently introduced. I run a mythtv box with pulseaudio (using PA 0.9.10 and mythtv 0.21) and have no sync issues at all.

That setup simply has the default ALSA output configured to be 'pulse' and mythtv is configured to use  ALSA:default as its output. Have you tried that? Maybe it works better..??

Mark


> 
> (In [20310]) Refs #5473. Adds a check for PulseAudio? at startup of 
> mythfrontend and mythtv. PulseAudio? causes delays that range randomly 
> between 500-2000 ms when playing back audio, so we abort startup if the 
> pulse audio server is currently running. Note: I've referenced a ticket 
> that adds PulseAudio? support to MythTV, but even using the PulseAudio? 
> API's the delay is still 300 ms; if we can get that down in the 20 to 50 
> ms range we can adjust when we display the video frames to compensate 
> for the delay (which we should be doing anyway when using multiframe 
> deinterlacers).
> 
> ---
> 
> I haven't contributed to that thread, but observed the same random delay 
> and just realized it was pulse related when myth made me turn off pulse.
> 
> Any thoughts on this?
> 
> 
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