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Slightly Jerky Scrolling Photos Video---How to Output it to Play Smoothly?

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Daniel Monskey
Slightly Jerky Scrolling Photos Video---How to Output it to Play Smoothly?
on Nov 27, 2014 at 5:02:51 am

I have a 17 second sequence of scrolling (R-L) photos that play with a slight infrequent jerkiness.
I am using FCP 7, on a MacPro with 2 x 2.8 Quad-Core Intel processors; 8 GB 800MHz memory; Lion 10.7.5. I am storing data on a Wiebetech Raid external drive system connected with a eSata cable.

I have output it using Compressor in Quicktime with Codecs: Apple ProRea 422 (HQ) Linear PCM
I have also added it to an After Effects project and output it with the same settings (Apple ProRes 422 (HQ) and I still have the same problem.
In both cases the .MOV video is about 456 MB, so not very large at all to slow things down.
What do I need to look at to get a smooth flowing sequence of scrolling photos?

Dan


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Dave LaRonde
Re: Slightly Jerky Scrolling Photos Video---How to Output it to Play Smoothly?
on Dec 1, 2014 at 9:03:56 pm

Surprise! It's probably not your playback hardware, it's probably your frame rate.

There's a phenomenon known as judder, which most frequently manifests itself in horizontal motion at lower frame rates. The fix: tweak the speed of the motion.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Daniel Monskey
Re: Slightly Jerky Scrolling Photos Video---How to Output it to Play Smoothly?
on Dec 1, 2014 at 10:27:46 pm

Thanks Dave. I've never heard of this judder.
What I get from your suggestion is I should try something like this:

slow down the rate of the scrolling photo sequence, output it and then speed it back up in a new timeline so I maintain the same time length---vis versa---or something like that.
I tried creating it in Adobe After Effects too and I still have the same problem.
I can test it with an existing sequence or .MOV file by speeding/slowing it down.
Dan


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Dave LaRonde
Re: Slightly Jerky Scrolling Photos Video---How to Output it to Play Smoothly?
on Dec 1, 2014 at 10:34:07 pm

AE's susceptable to judder, too.

Better than speeding up the footage only to slow it down -- which probably wouldn't fix a thing -- would be to work at a higher frame rate, if that's an option.

Or play around with the horizontal speed of the problem pictures.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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