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Old 09-13-06, 01:28 PM   #1
tabish121
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Default xxmc in Xine causes choppy video

Hey guys

I'm running the latest 8774 drivers with an 7600GS. I'm trying to get XXMC working in Xine to lower CPU usage, and when I enable it I get very choppy video. Its like I only get a couple frames a second or something. This sound is fine, and the video seems to skip to keep up with the sound.

I've setup the XvMCConfig in /etc/X11 on my FC5 box.

What else am I missing? Any Ideas?
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Old 09-13-06, 01:31 PM   #2
netllama
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Default Re: xxmc in Xine causes choppy video

Is this problem only present with xine (and not mplayer)?
What kind of content are you playing when you run into this problem?
Please generate and post an nvidia-bug-report.log.

Thanks,
Lonni
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Old 09-13-06, 03:23 PM   #3
pe1chl
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Default Re: xxmc in Xine causes choppy video

I had this same problem, with a completely different configuration.
(older driver, SuSE 9.2, 6600GT AGP)
It worked fine with normal video, and only showed a "slideshow" in HD.

I tried reading many threads, asking questions in some, and was never able to fix it until I built a separate server for my multimedia storage and the problem was suddenly gone.

Before: an ATA-133 IDE expansion card with 4 harddrives mounted inside the main machine, in the slot adjacent to the video card. IDE card used same interrupt as videocard. Choppy video, but when I let it play for 15 seconds then interrupted the player and played the same file again, it was fine.

Now: same ATA card with drives in a separate machine, NFS-mounted over gigabit ethernet (on a different interrupt): plays "OK" (still some framedrops and decoding errors, but they may be due to underpowered system and coding of the movies incompatible with the restricted decoding in XvMC)

I heard an explanation that the hardware-assisted decoding still requires multiple transfers of the data over the AGP bus, and that the total amount of data going around in the system (from the disks over the PCI bus to the CPU and back and forth over AGP to the video) simply exceeds the capabilities of the system.
How that results in the "slideshow" (while my system can even keep up with HD decoding in software in mplayer!) is not clear to me.
Also, why it works OK with NFS (also not known as particularly efficient) and not with a local disk, I don't understand.
It could be related to the shared interrupt.

Hopefully this provides some food for thought and experiments.
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Old 09-13-06, 04:25 PM   #4
mlampard
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Default Re: xxmc in Xine causes choppy video

This problem can be emulated on an fx5200 by setting the XvmcUsesTextures X config option. It appears only to affect Xine.
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Old 09-13-06, 04:32 PM   #5
netllama
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Default Re: xxmc in Xine causes choppy video

If it only impacts xine, and not mplayer, this sounds like an xine bug.

-Lonni
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Old 09-13-06, 04:40 PM   #6
tabish121
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Default Re: xxmc in Xine causes choppy video

Quote:
Originally Posted by netllama
Is this problem only present with xine (and not mplayer)?
What kind of content are you playing when you run into this problem?
Please generate and post an nvidia-bug-report.log.

Thanks,
Lonni
I don't use mplayer, so I don't know about that. I'm playing back both AVI's and DVD's, both seem to have the same problem.

System is an Athlon64 x2 4200 with a PCIx16 7600GS. I've got my data stored on a file server that is attached via a Gigabit network. The machine itself has one Seagate 320 gb SATA drive and 1gig RAM.

Bug report is attached, zipped because it was larger than 100kb
Attached Files
File Type: zip nvidia-bug-report.zip (26.0 KB, 99 views)
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Old 09-13-06, 06:29 PM   #7
pe1chl
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Default Re: xxmc in Xine causes choppy video

Quote:
Originally Posted by mlampard
This problem can be emulated on an fx5200 by setting the XvmcUsesTextures X config option. It appears only to affect Xine.
I have the XvmcUsesTextures option set (on a 6600GT). Did not know it was related to that.
I have this problem on mplayer.
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Old 09-13-06, 06:58 PM   #8
mlampard
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Default Re: xxmc in Xine causes choppy video

does setting the option to false fix it for you?
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Old 09-14-06, 03:13 AM   #9
pe1chl
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Default Re: xxmc in Xine causes choppy video

Quote:
Originally Posted by mlampard
does setting the option to false fix it for you?
No way to test that anymore, it has been fixed by moving the disks.
I'll test it without the option the next time I reboot, to see how that performs.
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