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This topic comprises 2 pages: 1 2
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Author
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Topic: Film Judder
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 08-18-2017 04:42 AM
Have you checked alternative content too? Maybe your problem is in the content itself as a result of a previous down-conversion from e.g. 30 fps to 24 fps or 23.976 fps.
Also, when playing from a PC, check the refresh rate of your HDMI output in your operating system. Ideally, it should match the framerate of your content, if that's not possible, it should be as high as possible (At 60 Hz, judder effects should be unnoticeable for average human beings, at least if the rest matches up). Most modern players do have the possibility to set the refresh rate of your output dynamically to match the frame rate of your content, as long as your video card supports it. You want to use this feature, if it works.
In some cases, when playing from a PC, you get horizontal "tearing lines", this is caused by your player not syncing up with the "vertical blanking" of your video card. Most players do have an option for this.
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Jim Cassedy
Phenomenal Film Handler
![](http://www.film-tech.com/ubbmembers/4115a.jpg)
Posts: 1661
From: San Francisco, CA
Registered: Dec 2006
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posted 08-18-2017 10:22 AM
quote: Richard May My bigger problem is playing from a computer (PC).
Without knowing more about your exact setup and the equipment involved, I can't comment authoritatively about what's causing your problem.
There are several things that could be causing your problem, frame rate conversions or mis-matches being one of them, as others have mentioned.
But, anecdotally, whenever I've had the issue you describe, it was almost always a matter of 'computer resources' not being up to the task.
As I've mentioned before in other posts, I often use "Playback-Pro" at various shows, and I sometimes ran into this problem.
In my case, I went & got a Macbook Pro, with the most memory available, and replaced the standard drive with one that spins at 7200rpm.- - and I use this Mac ONLY for video playback, so it doesn't have a lot of other 'crap' on it. I realize you may not have the time or resources to do this, but I'm just sayin that once I upgraded and de-cluttered my "playback computer" , I've never had the 'motion jidder' problem again. That's what worked for me.
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