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  #1  
Old 26th May 2008, 10:27 AM
genci Offline
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Fedora 9 - sound playback stutters

Hi all,

I've just done a clean upgrade to Fedora 9 and while I have sound working, I've noticed that playing back mp3's and videos (avi) the sound stutters every few seconds. It does this in a variety of apps eg VLC, Xine, Amarok. I tried this in KDE and Gnome without any improvement. Listening to videos with sound in Firefox work without this stutter.

Any ideas?

Thanks
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  #2  
Old 26th May 2008, 06:28 PM
A.Serbinski Offline
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Make sure that you configure xine to use pulseaudio -- you'll need to install "xine-lib-pulseaudio", then when you go into the setup window for xine and select the "audio" tab, you'll be able to select pulseaudio as the audio driver.
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  #3  
Old 27th May 2008, 07:50 AM
genci Offline
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I've done that and got no sound at all from the mp3. I have now changed the xine audio driver back to "auto" and there still isn't any sound. It definitely still plays and stutters in VLC and amarok so I must have been wrong before when I said it played/stuttered in xine.
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  #4  
Old 27th May 2008, 01:29 PM
ruckus Offline
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I am having a similar problem after just upgrading to F9. The sound stutters in amarok and xine but is also too fast in mplayer and flash. For example a 6 second clip plays in about 5.8seconds (using the command:
Code:
time paplay /usr/share/sounds/KDE_Logout_new.wav
I don't think the issue is with PulseAudio because using ALSA directly also has the same result:
Code:
pasuspender -- mplayer -ao alsa /usr/share/sounds/KDE_Logout_new.wav
Have you experienced this speed-up?

ruckus
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  #5  
Old 28th May 2008, 09:00 AM
genci Offline
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Quote:
Originally Posted by ruckus
I am having a similar problem after just upgrading to F9. The sound stutters in amarok and xine but is also too fast in mplayer and flash. For example a 6 second clip plays in about 5.8seconds (using the command:
Code:
time paplay /usr/share/sounds/KDE_Logout_new.wav
Not that I've noticed.
Code:
$ time paplay /usr/share/sounds/KDE_Logout_new.wav  
real	0m6.130s 
user	0m0.008s 
sys	0m0.020s
I've seen other threads on sound playing back like chipmunks on helium, so maybe your issue is partially related to that?
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  #6  
Old 28th May 2008, 09:18 AM
daniel.j.laird Offline
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I too have done an upgrade of Fc8->fc9 and am having audio stutters on all playback (no music for now then). I have tried all sorts of things with the pulse audio daemon.conf file with no luck.
I searched on google and found some BUGS of XINE backend and audio stutters and it appears that a kernel upgrade might solve it so we might have to wait until a new kernel is made available.
Dan
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  #7  
Old 28th May 2008, 10:40 AM
genci Offline
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I see there is another thread on stuttering with the Xine engine.

The two bugzilla reports here and here discuss it.

At least I'm not alone with it.
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  #8  
Old 28th May 2008, 04:12 PM
ruckus Offline
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As discussed above I may be having a different problem but just for your information, I think I have fixed the speed and stuterring issues on my machine.

I added the following to the kernel arguments on the GRUB boot screen:
Code:
nohz=off highres=off
I got these from this page.

Might be worth giving a try. You can also add the arguments directly into the file /etc/grub.conf

ruckus
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  #9  
Old 15th August 2008, 04:30 PM
eddieedwards Offline
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I'd like to add a "me too" here. I recently installed F9 after running F8 on this Vaio laptop. Sound worked without a hitch there, so it's not a hardware issue. I tried adding the nohz=off and highres=off arguments to my kernel args, but that didn't help. (My mouse is jerky at times, too, so I wonder if it is related--probably "just" a USB issue tho.).

I *did* find this in dmesg, but not sure if it related:
ALSA sound/pci/ac97/ac97_codec.c:2152: MC'97 1 converters and GPIO not ready (0xff00)
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  #10  
Old 14th April 2009, 09:49 AM
delarius Offline
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Xine stuttering

Hi,
New to the forums here, well new to posting anyways.
I've been working on this very issue myself, and seem to have found a solution that works for me.
I installed the alsa-driver.i386 via yum, which will also pull down an alsa-kmdl-* dependancy.
I had to enable atrpms to get this (could have installed via rpm but yum is so much more efficient.)
After a reboot, and it's much better. No more stuttering! The only minor downside is the audio does a brief rush right off the start when watching videos, for a second or two, then it all seems to settle down and looks and sounds fine.
Hope this is helpful to someone else, as it's been a challenging evening trying to get this annoying situation resolved.
Be well,
Del
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