[anderskkan]

Intel Core2 Duo 3GHz
2GB RAM

NVIDIA GeForce 8600 GTS 512MB
v185.19
Automatic refresh rate change enabled

Auzentech X-Meridian 7.1
CMI8788 ALSA v1.0.19

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System:
Ubuntu 8.04 "Hardy Heron"
2.6.24-23
i686

XBMC-beta1
r19672
manual

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Problem:
Playback of 1080p MPEG-2 23.976fps inside MKV (remuxed blu-rays) are VERY, VERY stuttery regardless of VDPAU on or off (@24p output)

CPU usage is not high at all. Something else is causing this problem. Not the usual stutter. More of an back and forth motion.

- Perfect playback of the same 1080p MPEG-2 23.976fps using XBMC (~same build) on Windows XP SP2 @24p)
- Perfect playback of the same 1080p MPEG-2 23.976fps with menu overlay (ie not full screen and refresh rate @ 60Hz)
- Perfect playback of 1080p MPEG-2 29.97fps (@60p)
- Perfect playback of 1080p AVC/VC-1 23.976fps (@24p)




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Log:
http://pastebin.ubuntu.com/157953/

[althekiller]

Can you post a sample somewhere?

[anderskkan]

Sorry for taking so long. Had to contact a friend who could lend me some space to put the samples.


http://www.earselect.se/anders/mpeg2.mkv

Also uploaded sample for this problem:
http://forum.xbmc.org/showthread.php?tid=49606

[anderskkan]

During testing of this problem (http://forum.xbmc.org/showthread.php?p=3...post323847) I found that MPEG-2 1080p from Blu-rays with the frame rate of 23.976fps are detected by XBMC as 24fps.

Don't know if it is the cause of this problem (as the frame rate detection of AVC also fails on 23.976fps movies WITHOUT causing this kind of bizzare stuttering at 24Hz)

When setting the refresh rate (manually) to 59.94Hz this problem goes away.

And btw it seems to affect ALL my Blu-ray movies with MPEG-2 codec.

[motd2k]

I suppose you could try the smoothvideo branch, how bad is the strutter though? 23.976fps played at 24fps certainly shouldnt be 'VERY, VERY' stuttery. Are you using XRandR, and do you have the correct modelines setup for such? Have you disabled the composite extension and enabled v-sync?

[anderskkan]

I suppose you could try the smoothvideo branch, how bad is the strutter though? 23.976fps played at 24fps certainly shouldnt be 'VERY, VERY' stuttery. Are you using XRandR, and do you have the correct modelines setup for such? Have you disabled the composite extension and enabled v-sync?

Yes to all your questions. And AVC plays back without this kind of stuttering even though 24Hz is used. It's something else that is the cause of this problem.

The stuttering is BAD...I mean like watching at 10-15 fps.