Stuttering frames while slowly panning - Is it my machine or a setting somewhere?

[Matt Pain]

Hi,

I have a shot filmed on the EPIC at a base frame rate of 25fps with the record frame rate at 50fps, redcode 9:1, shutter set at 90 degrees.
The shot is a portrait of 4 Russian miners that slowly pans and there is a considerable amount of shuddering / ghosting going on when viewing in REDCINE x.
I am working on a PC workstation. Intel Core i7 CPU 3.20 with 64 gb internal ram - Windows 7
I previewed the file in Premiere Pro CS 6 and CC when rendered there is still this same issue.
I exported as several formats from Quicktime h264 at 10,000kbs - Mpeg H264 at 10,000kbs - Avid DNxHD, MXF OP1a etc
When i viewed these exports in VLC and quicktime they also had the stuttering however the ghosting and stuttering is inconsistent, this made me wonder if it actually the machine and the way it is playing the file back, which i do not expect because it shouldn't be the case.
I decided to upload one of the exports to vimeo, still the same issue when watching it on firefox on the PC, However, I decided to watch it on my mac powerbook...the stuttering is almost completely gone and there is no longer ghosting
Is this problem purely just my pc and the way it is playing back the file?
If someone has some input or similar experiences i would really appreciate it.

You can view the file on a private vimeo link here
How does it play back for you?

https://vimeo.com/94950940
pass: testshot

I really would appreciate any feedback

Thanks in advance.

Matt

 

[Paul Russell]

I'm seeing some slight juddering in the pan, especially as it reaches the third face, but it could be the compression/bandwidth.

 

[Marc Wielage]

A 90-degree shutter speed is going to do this, since it's a byproduct of the way the shutter works. I would try bringing it into Resolve and using Motion Blur to ease off on the staccato/judder problems of the 90-degree shutter in pans. I also suspect this could be a combination of shutter speed and rolling shutter, which can interact in some situations.

It's for reasons like this that you have to shoot tests prior to production so there aren't any surprises later on. In this case, I do think that something like Resolve could minimize 30-40% of the problem.

 

[Michael Romano]

+1 90º shutter.

 

[Matt Pain]

Hi guys,

Thanks a lot for the responses.
Why do you think it is far more obvious on the PC than the Mac?
Could you explain a little more why the 90 degree shutter causes this and what a better solution might have been.

Thanks a lot again, I appreciate it.

Matt

 

[Björn Benckert]

The studdering increase with three things:
Pan tilt speed, there is a range between slow and "swosh" pans where the studder is the most.
shutter speed/sharpness the sharper and the less shutter speed, the more studder.
And also, most importan and not so well known, the size of screen when viewing the matterial... the bigger the more studder.

See it like this: the text roll in the end titles of a feature is about the fastest speed you can pan and keep a sharp image with lot of details without getting studder on the movie screen. When you go for tv or smaller screens you can pan / tilt faster. And then offcourse this does not apply to quick swoosh pans or tilts.

So to try to solve your issue you can try to "x blur" the footage a bit. i.e blur the matterial in horisontal only or apply "post motion blur" but when doing so you will see that there is also a limit of motion blur that you can apply before the image looks smeared.. sometimes there is no gap between studder and to smeared... then, well there is not much to do than pick one of the two evil. But as you shot 90 deg you can atleast dubble your motion blur / x blur and get half the issue, hopefully that is enough to solve it for your screen size.

in retrospect you should have been at 180 shutter and or made a slower pan. It's quite freaky as a lot of time it looks more than fine on the small camera monitor and even on the on set client screen... then when you move up to 52" screens... the shit studders. So always when do pans take precautions.

There is actually charts that you can buy that has the three parameters:

Shutter.
camera movment (how fast something moves from edge to edge of frame)
display Screen size.


Those charts has a span between quite slow and very rapid where you simply should not be panning / tilting around.