BUG: audio playback skipping/hiccups

[xine-user.20.mmad]

Hello,
My bug is much like this bug:
https://bugzilla.redhat.com/show_bug.cgi?id=443076
I noticed a certain debug message appearing with
 # xine --verbose=5
 ...
 audio_out: inserting 7669 0-frames
 ...
That message appeared every now and then, whenever there was a glitch.
Exactly 2 lines of "inserting ..." per glitch.

My idea: Maybe this is a system realtime problem ?

Starting ntpd -> problem reappearing immediately after ntp considers ntp
servers valid (even if ntpd is started while xine is already playing)
Stopping ntpd, stopping time slewing with 'hwclock --hctosys' -> problem
gone immediately, even while playing.
Hwclock might play a role here because it sets /etc/adjtime to all
zeroes. I have to look into adjtime again, for I am not yet
knowledgeable about it. As long as there is nonzero content in
/etc/adjtime, the problem persists after stopping ntpd
 
System: Gentoo, using xine-ui 0.99.5 and xine-lib 1.1.11.1
Problem: Sound playing for 2-5 seconds, then 2-5 seconds pause, then
sound playing again for 2-5 seconds. Verry regular pattern.
Affected applications: xine-ui, amarok.
Unaffected application: mpg123 (plays fine)
Related systems: openntpd 3.9_p1 , started with 'ntpd -d -s'
 
My resolution: Turning off ntpd
My real problem: My system clock is going at the wrong pace, ntpd is
compensating this by slewing my system forward every 2 seconds by a tiny
amount. This seems to confuse xine-lib when playing back.
 
 Real solution: stop ntpd and look for proper adjtime usage, then try
ntpd again, maybe.
 
 Some more info on my config:
 Hardware NVidia NForce4-4x chipset, NVidia CK804 onboard sound
(driver-wise an Intel8x0 AC97 system)
 XEN 3.1.3, the affected system running as Dom0
 
 Kernel(Dom0): Gentoo 2.6.21-xen
 Kernel config:
 Character Devices->
  CONFIG_RTC=m
  CONFIG_GEN_RTC=m
 Realtime Clock->RTC Class->
  CONFIG_RTC_HCTOSYS=y
  CONFIG_RTC_HCTOSYS_DEVICE=rtc0
  CONFIG_RTC_DRV_CMOS=y
 
 Loaded module for RTC:
  genrtc
 
If anyone needs further info, feel free to contact me by mail:
xine-user.20.mmad@... is working as of now ;)

HTH, MadMartin


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