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Stuttery Video in movement scenes.

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Saul Vest
Stuttery Video in movement scenes.
on Aug 18, 2010 at 12:10:56 pm

I know just enough to be dangerous.

I shot on a DSLR 1080p30 (canon)
Transfered to my iMac27,

Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache (per core): 256 KB
L3 Cache: 8 MB
Memory: 8 GB
Processor Interconnect Speed: 4.8 GT/s

Chipset Model: ATI Radeon HD 4850
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB


Using latest OS X 10.6.4

convert my footage from card to pro-res 4:2:2 using Streamclip

work back and forth between AE CS5 and FCE always rendering to pro-res 4:2:2 frame rate at 29.97 through work-flow... always de-interlaced.

Output final product from FCE to h.264 for web delivery. Plays back fine on my computer(maybe an occasional, very slight stutter), but when I upload to various sights, any scene with motion stutters. It looks terrible! Check out the lateral dolly move near the beginning. Yuck!

Any guidance would be greatly appreciated.

Here is a link to the spot on Vimeo... http://vimeo.com/13895095

password = peanuts


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Chris Blair
Re: Stuttery Video in movement scenes.
on Aug 20, 2010 at 2:18:43 am

We can't see your video....site says it's password protected. My guess would be a mix up somewhere on the field/frame issue. You need to figure out what your source material used and stick with that through your production chain with NO deinterlacing tools used throughout...UNTIL your final encode for the web and only if the original footage is interlaced.

If you're working progressive from acquistion to output...do nothing except keep everything progressive. If you're working interlaced from acquisition to encode...DO deinterlace on final output for web.

That said, software deinterlacers are a dicey lot and depending what you're exporting with, some do a better job than others. Then...what about if you have mixed material in your project...meaning some is interlaced and some is progressive...which is quite common.

In that case...you likely have to live with some artifacting somewhere...and it will usually be on the interlaced footage.

Give us the password so we can see what you're talking about.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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Saul Vest
Re: Stuttery Video in movement scenes.
on Aug 20, 2010 at 2:31:23 am

It was progressive all the way through. The password is peanuts.

Thanks from a fellow Hoosier!


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Chris Blair
Re: Stuttery Video in movement scenes.
on Aug 20, 2010 at 4:21:31 pm

Hey I like the spot! It looks pretty darn good overall and once it has buffered (played once), the stuttering wasn't too bad on the dolly move. Did you shoot 24P in a camera that adds pulldown? We use the Panasonic SDX-900 and you can shoot 24P with pulldown or straight 24P with no pulldown (can't remember what the settings menu calls it)...but we'll sometimes see issues on really fast pans or dolly moves across stationary objects using 24P with pulldown.

There isn't anything you can do about it after the fact. I'm old enough to have shot motion picture film and there is actually a panning speed guide that was created to help avoid these issues, which are inherent in shooting at only 24 progressive frames per second.

So if you shot 24P (with no pulldown), edited 24P (with no pulldown) and somehow expored to 29.97 or 30fps that's the only thing I can think that would cause that. Otherwise...it really didn't bother me much watching the video..except for the first time through. Second time I played it the dolly was much smoother.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


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