[mythtv-users] .22 and pulseaudio

[Ma Begaj]

2009/10/27 Nicolas Will <nico at youplala.net>:
> On Mon, 2009-10-26 at 22:57 -0400, Phil Linttell wrote:
>>
>> On 10/25/2009 07:01 AM, mythtv-users-request at mythtv.org wrote:
>> > Date: Sun, 25 Oct 2009 01:32:45 +0100
>> > From: Nicolas Will <nico at youplala.net>
>> > Subject: [mythtv-users] .22 and pulseaudio
>> > To: mythtv-users at mythtv.org
>> >
>> > Hello
>> >
>> > Ok, I'm now running MythTV .22 everywhere, on Ubuntu 9.10.
>> >
>> > On my laptop, a .22 frontend, but not dedicated, I now have an issue.
>> > Whenever I have the frontend runnin, all sound events from the rest of
>> > my environment are not emitted to my speakers. Instead they are queued
>> > until I exit MythTV, when I get a very nice compilation!
>> >
>> > I did not have this problem with .21/9.04 and earlier, where everybody
>> > coexisted and MythTV did not take over all the sound for itself.
>> >
>> > Any pointers?
>> >
>> > Nico
>> >
>> >
>> Hi Nicolas,
>>
>> As I understand it, the default behaviour of myth is to suspend pulse
>> when it starts, and use alsa directly.
>>
>> You can try setting the environment variable
>> EXPERIMENTALLY_ALLOW_PULSE_AUDIO=1
>>
>> to force myth to play through pulse.  I'm doing this very successfully
>> on 9.10...
>
> Yes, that's what I had found.
>
>
>>  with two caveats...
>>
>> In /etc/pulse/daemon.conf, set:
>>         realtime-scheduling = yes
>>         realtime-priority = 5
>>
>> I also set ...
>>         default-fragments = 15
>>         default-fragment-size-msec = 20
>> although I'm not sure how much difference this makes.
>
> I'll try.
>
>>
>> I'm running VDPAU, so I also set my processor clock to maximum (3GHz
>> in my case) when starting mythfrontend which seems to help with the
>> sound processing.   Otherwise, with VDPAU the clock rate would stay at
>> 1GHz.
>>
>> #!/bin/sh
>> echo "3000000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
>> mythfrontend
>> echo "1000000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
>>
>>
>
> I will try as well.
>
>
>
>> If pulse works for you, you'll be able to enjoy systems sounds
>> overlayed on top of your recordings.  Enjoy.
>
> I certainly don;t want that on my living room system, but on the laptop,
> where I put TV as a background app, I do.
>
> Thanks for all this !
>


I know that I read it can switch on-the-fly sound output from one card
to another, which is pretty useful (at least to me).

I could finally use my A2DP bluetooth headphones on the fly, without
stopping the video/music and without changing sound device in the
mythfrontend configuration.