Sound quality in calls.

Armin ranjbar zoup at
Thu Sep 18 13:46:04 CEST 2008

On Thu, 18 Sep 2008 10:50:03 +0100
Al Johnson <openmoko at> wrote:
> Thanks. This sort of question is _much_ more likely to get a useful
> answer.
> I've not looked into this directly, but IIRC there were reports of
> pulseaudio doing sample rate conversion on almost everything that was
> played, munching CPU in the process and not necessarily leaving enough
> for smooth decode of the media file. The media player in 2007.2 was
> apparently affected by this, but if patched to use alsa directly it was
> fine. I can't verify this as I had gstreamer errors with the mp3 I tried
> it with. I think pulseaudio has been dropped from 2008.8 and FSO because
> of this. I don't know what the situation is with qtopia, but if you run
> top while playing a file you should see if anything's  hogging CPU. I
> suggest you search the list archives for the original reports on this
> issue as they probably contain details I've forgotten or got wrong ;-)
> mplayer by default  plays directly through alsa so isn't affected by the
> sound server issues. That you say sound is nearly perfect in this case
> shows the hardware limitation isn't really the issue.
> I haven't looked closely at the whole media playback issue so I don't
> know what the best solution is. If you're lucky someone who does might
> read this, but you may be better off reposting with a more appropriate
> subject line.

Already filed a bug on this :

the Mplayer on om2008 is directly connected to OSS not alsa, when i -ao
alsa it becomes 'very sensible' to loads , audio stop and resumes even
after each characters into terminals , strange ...

Armin ranjbar , System Administrator

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