Sometime over the last month, a rawhide update bestowed upon me a version of gnome-cd which skips. Bits of the audio drop out every 30 seconds or so.
If I play a CD with cdplay, it sounds fine, as always. So I believe the problem lies with gnome-cd, rather than elsewhere in the system.
Anybody else seen this? If there's any useful information I could extract from the system, please let me know.
Thanks,
jon
On Mon, 28 Feb 2005 16:11:25 -0700, Jonathan Corbet lwn-fedora-test@lwn.net wrote:
Sometime over the last month, a rawhide update bestowed upon me a version of gnome-cd which skips. Bits of the audio drop out every 30 seconds or so.
im not seeing this... i just listened to a whole album.. no problems. maybe something is spiking cpu usage or memory spike and this is just a symptom.
-jef"man this gerado album gets better and better everytime i pick it up"spaleta
tir, 01.03.2005 kl. 00.32 skrev Jeff Spaleta:
On Mon, 28 Feb 2005 16:11:25 -0700, Jonathan Corbet lwn-fedora-test@lwn.net wrote:
Sometime over the last month, a rawhide update bestowed upon me a version of gnome-cd which skips. Bits of the audio drop out every 30 seconds or so.
im not seeing this... i just listened to a whole album.. no problems. maybe something is spiking cpu usage or memory spike and this is just a symptom.
Dosn't gnome-cd play the cd directly analogly using the nice little cable between the cdrom and the soundcard?
On Wed, 02 Mar 2005 16:08:32 +0100, Kyrre Ness Sjobak
Dosn't gnome-cd play the cd directly analogly using the nice little cable between the cdrom and the soundcard?
it use to... i dont keep up with whether or not gnome-cd is using gst now and if the rawhide gst has the digitial extraction bits enabled yet.
If its just playing analogly... where could the problem with playback for the original reporter be software-wise?
-jef
ons, 02.03.2005 kl. 16.19 skrev Jeff Spaleta:
On Wed, 02 Mar 2005 16:08:32 +0100, Kyrre Ness Sjobak
Dosn't gnome-cd play the cd directly analogly using the nice little cable between the cdrom and the soundcard?
it use to... i dont keep up with whether or not gnome-cd is using gst now and if the rawhide gst has the digitial extraction bits enabled yet.
If its just playing analogly... where could the problem with playback for the original reporter be software-wise?
-jef
I don't have a clue - but i have also experienced this behaviour. It happened on an old 200mhz celeron running fc3 *before* some update which happened just before christmas. After the update, everything was fine...
man, 28,.02.2005 kl. 16.11 -0700, skrev Jonathan Corbet:
Sometime over the last month, a rawhide update bestowed upon me a version of gnome-cd which skips. Bits of the audio drop out every 30 seconds or so.
If I play a CD with cdplay, it sounds fine, as always. So I believe the problem lies with gnome-cd, rather than elsewhere in the system.
Anybody else seen this? If there's any useful information I could extract from the system, please let me know.
I filed this today because I was seeing skips with mixed data/audio CDs. Is the CD you played back by any chance in this category?
http://bugzilla.gnome.org/show_bug.cgi?id=168978
Cheers Kjartan
Kjartan Maraas kmaraas@broadpark.no wrote:
Sometime over the last month, a rawhide update bestowed upon me a version of gnome-cd which skips. Bits of the audio drop out every 30 seconds or so.
I filed this today because I was seeing skips with mixed data/audio CDs. Is the CD you played back by any chance in this category?
I have such CDs, but *every* CD I play skips, regardless of whether it has data tracks or not. So I don't think that's it.
I ran it under strace for a bit today. As others have guessed, gnome-cd is not actually dealing with the music stream itself; that goes direct to the sound card from the play. I see the gnome-cd process doing two things:
- Talking with the X server. Not surprising.
- ioctl(20, CDROM_DRIVE_STATUS, 0x7fffffff) = 4
So now I'm beginning to wonder: might the real problem be a regression in the kernel such that this ioctl() call perturbs a running CD drive? *This* is the sort of problem I can try to track down (whereas what goes on inside GNOME is a deep, dark mystery), so I think I'll try to carve out a bit of time to dig further.
jon
Jonathan Corbet lwn-fedora-test@lwn.net wrote:
Sometime over the last month, a rawhide update bestowed upon me a version of gnome-cd which skips. Bits of the audio drop out every 30 seconds or so.
Update time: research tells me that gnome-cd is reading the data from the CD and feeding it to the sound card itself. At least, when I play a CD with gnome-cd, the "PCM" mixer control affects the playback volume, while the "CD" control does not.
If, instead, I play with cdplay or grip, the volume is adjusted with the "CD" slider.
The gnome-cd people had to go to some effort to make it work that way; one wonders what advantages they were going for.
Meanwhile, with current rawhide, the skipping problem has gone away. So I'm happy...
jon
Jonathan Corbet Executive editor, LWN.net corbet@lwn.net
Alan Cox alan@redhat.com wrote:
The gnome-cd people had to go to some effort to make it work that way; one wonders what advantages they were going for.
The newer machines don't have an analogue cable for this to save a few cents
Figures. It leads to some interesting behavior - like the CD continuing to play for a couple of seconds after the disc has been ejected. I suspect it will drive more users into the "we need extra low latency!" camp as well.
jon
Jonathan Corbet Executive editor, LWN.net corbet@lwn.net
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Alan Cox -
Jef Spaleta -
Jonathan Corbet -
Kjartan Maraas -
Kyrre Ness Sjobak