Public bug reported:
It's hard to say whether this is a bug in the kernel or Xine...
I found this bug by running Amarok and occasionally the song would speed
up until the buffer ran out and would stutter briefly, then fix itself.
It only happened with Amarok and would happen with any input source.
Then I tried using a Xine frontend directly, since Amarok uses that as
it's audio engine. This had the some problem... and with verbose mode
on it'd occasionally output lines like this when the stutter happens:
audio_out: inserting 7445 0-frames to fill a gap of 15218 pts
I managed to find some old posts about the hw clock giving errors like
this, but from ~2007. However, it did lead me to investigating the
hwclock command and it's man page. Eventually I read about auto
adjusting from the kernel, and tried to disable it by issuing:
sudo hwclock --hctosys --utc
Viola! The problem seems to have stopped. Thus, either Xine isn't
handling the adjustments gracefully, or the kernel behaviour has changed
somehow that breaks things. This only became a problem in the last few
weeks, so I suspect one of the kernel upgrades did it (I'm afraid I'm
not sure of the exact one and have already spent masses of time trying
to figure out what the cause of the erratic playback was - hopefully
someone with more clue about either Xine or the kernel hwclock
adjustment code can enlighten me!)
Xine versions:
xine (X11 gui) - a free video player v0.99.6cvs.
Built with xine library 1.1.16 (1.1.16.1)
Found xine library version: 1.1.16 (1.1.16.3).
ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
HibernationDevice: RESUME=UUID=fc912eaf-9e22-4f67-abca-297df75de5b4
MachineType: Gigabyte Technology Co., Ltd. GA-MA78GM-S2H
NonfreeKernelModules: nvidia
Package: linux-image-2.6.28-15-generic 2.6.28-15.52
ProcCmdLine: root=UUID=6c71dc50-69a5-4c53-bb1b-9021d1751026 ro quiet splash
ProcEnviron:
PATH=(custom, user)
LANG=en_NZ.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-15.52-generic
SourcePackage: linux
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug
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Adjustment of hwclock breaks Xine
https://bugs.launchpad.net/bugs/439738
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