Jerky playback Dharma B2 and SVN /Ion

I use almost the same setup as L1onsG8 except I run Dharma Beta 2 Live from a USB Stick.
Just bought the Asrock 330 and probably sounding a like a total noob here but I get jerkiness and and jitter. I gotta say that I experienced nicer quality video and smoothness on my old Tvix 4100. My tvix was set to Auto EDID and whenever I played a blueray converted to .mkv it changed display mode to 24hz.
I probably have the setting wrong so I wonder you guys could share what settings would be best or what you use
My setup:

Asrock 330HT 2GB and 512mb shared video memory

In XBMC > System
Display Mode: Fullscreen #1
Resolution: 1920x1080
Refresh Rate: 60.00
Vertical Blanc Sync: Always Enabled
Enable LCD/VFD: checked

Video>Playback
Render Method: Auto Detect
VDPAU: checked
Adjust display refresh rate to match video: checked
VDPAY Studio Level Color Conversion: checked
Video Post Processing: disabled
Sync playback to display: checked
AV sync: Videoclock/Resample Audio

See something wrong here ? Should I just set the display refresh rate to 24 or does XBMC manage to do that i.e is it able to sense the movie frame rate ??

i have an asrock ION, win 7, xbmc dharma B2 setup. after installing dharma 1 i had stuttering in dvd isos and 720p movies.
Same problem with dharma 2. I was just about to rollback to previous stable version when i changed remder method from AUTO to SOFTWARE. That solved it for me. With hardwareacceleration enabled playback and GUI is better than with previous versions. Thx XBMC!

Thanks! Changed the render method as well, and yes it does work better !

Good for you!

There's no science behind my solution, just trial and error. I have noticed in other apps, especially audiorecording software that "auto" does not equal correct choice...

Did you guys turn on one of the fancy scalers?

Yes I did, however I could'nt decide which one looked better I did notice though that if I set it to "cubic" or "Lanczos3 optimized" that the video got choppy, so I ended up setting it to "Auto" will do some more testing. BTW love the settings you can do in the Video OSD and very much like to be able to do the video calibration during playback Thanks!

Auto will choose bilinear for HD and lanczos3 optimized for SD, so that would explain it.

Yes that explains why Auto and bilinear looks the same on the HD clip I was testing Also believe that bilinear was the default settings so it's ok to leave it like that. Have not yet tried any SD material. As the video got choppy in HD with the other scalers, is that because cpu/gpu can't keep up ??

Yes.

bobo1on1 Wrote:What that setting does is synchronize the video to the vertical blank, that way it gets rid of any video stutter.

What do you mean by "correction/errors in the info section" ?
If you press 'o' during playback, you should see a section with the refreshrate, missed, speed, sync and error.

I have played with this setting but am still not sure what it is doing. How does it determine the frequency of vertical blank? Is "vertical blank" in this context the same as vsync?

I always see from codec-info screen that it says it adjusts by 0.1% regardless of what I tweak my modelines too as if it is massively rounding up and assuming 23.976 versus 24.000. Is it not designed to work in the case where the refreshrate is out by a little (eg 23.9764 refreshrate with 23.976024 fps source material)?