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Old 12-14-08, 08:12 AM   #13
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Default Re: 24hz from PC

Originally Posted by Jon View Post
A jitter every 20 seconds is more likely a problem with pdvd than the 24hz mode. I watch all my blurays in this mode off the PC and PS3 and don't have any problems with it.

I picked the scene from Batman begins where it slowly moves across the mountains... and I would always notice a little bit of a jitter there and then I started to notice it in all films... But the jitter would always be in specific places, usually when the camera was panning horizontally. They were not at fixed intervals. With the 24hz mode, it looks totally smooth to me now.
I think it's a vista specific issue as I have it with all my playback programs. VLC, mpc HC and pdvd all suffer from it. And it's completely random for me, but at a steady interval of ~30seconds.
Both ATi and nvidia suffer from it, but the problem can almost be eliminated on ati cards by the use of powerstrip. Here's a thread about the issue over at avsforum.com
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Old 12-15-08, 07:45 AM   #14
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Default Re: 24hz from PC

Yeah also aside from the jitter issue, 24hz also has issues with lip sync after pausing the movie for awhile, so I've put it back to 60hz and all is good again. I may have paid a bit more than I intended, but I'm glad I got a screen that works well with DVI-HDMI (based on Jon's post, thanks!), if I'd got one that wouldnt display properly from PC I would have been screwed.

Anyway, 60hz isnt that unsmooth anyway, still looks great IMO So even if I'd got a "real" 5:5 120hz screen, I wouldnt be using 24hz probably anyway due to the issues.
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Old 12-19-08, 12:15 AM   #15
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Default Re: 24hz from PC

The jitter that your seeing is due to the conversion from 24hz to 60fps. Typically what most regular software will do is take the 24 frames and blend the frame before and after to generate a new frame, this brings you up to 48fps. The difficulty is when you need to generate the other 12fps, how you do it, and when you place them. Depending on how good the software is, and how fast your computer is, the additional 12 frames a second can go unnoticed, but if you do a bad job you'll get a stutter.

I find using the built in hardware decoders helps the most (newer cards), while the older ones need to brute force it with cpu time.

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