Messages in this thread | | | From | Denis Vlasenko <> | Subject | Re: mplayer + heavy io: why ionice doesn't help? | Date | Sun, 20 Aug 2006 18:43:58 +0200 |
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On Sunday 20 August 2006 16:43, Lee Revell wrote: > On Sun, 2006-08-20 at 10:22 +0200, Jan Engelhardt wrote: > > > > > >It helps. mplayer skips much less, but still some skipping is present. > > > > Try with -ao alsa, then it should skip less, or at least, if it skip, skip > > back so that less audio is lost. > > When playing audio-only files, it is always wise to specify e.g. -cache 320 > > which proved to be a good value for my workloads. > > > > Only with the very latest versions of mplayer does ALSA work at all. > It's unusable here because it resets the auduio stream on each underrun > rather than simply ignoring them.
I'm not sure that I ever got an underrun (may check it for you if you need that, how to do it?), but mplayer -ao alsa is working for me just fine.
I eliminated skips due to CPU and disk using nice and -cache 8000. I still can make it skip when my KDE background picture is changing.
I think that these skips are caused by the X server. It has no prioritization for request handling and thus it does not paint mplayer output fast enough: it needs to repaint background and semi-transparent konsole(s), and that is taking a few seconds at least.
This is probably aggravated by serializing nature of Xlib, according to:
http://en.wikipedia.org/wiki/XLib http://en.wikipedia.org/wiki/XCB -- vda - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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