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Old May 2nd, 2016, 12:52 PM   #1
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Jitter/Stutter when panning w/ BMPCC

Hello all,
I'm fairly new to BMD gear.....when shooting in raw there is a jitter or stutter like effect going on but clears up after the pan. I also did the same pan shot in pro res and it played smoothly..no stutter...I am editing with fcp7 on a 2006 Mac Pro and it does the same thing on my 2009 Mac Book Pro.... I read in another forum that it could be how the video was encoded which is pro res hq or the fact that my computers need to be upgraded.
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Old May 2nd, 2016, 01:56 PM   #2
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Re: Jitter/Stutter when panning w/ BMPCC

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Originally Posted by Reggie Moser View Post
...when shooting in raw there is a jitter or stutter like effect going on but clears up after the pan.
Depends on your frame rate, your lens, and how fast you pan. Film will show stutter if the pan is too fast for conditions; it's not simply a CODEC problem. The solution to most pan problems is to slow down the pan.
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Old May 2nd, 2016, 02:05 PM   #3
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Re: Jitter/Stutter when panning w/ BMPCC

But Reggie said it's doesn't stutter when he shoots in prores so my guess is something is wrong with how he converts the raw footage.

What is your workflow in dealing with the raw footage?
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Old May 2nd, 2016, 02:56 PM   #4
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Re: Jitter/Stutter when panning w/ BMPCC

Noa,
I'm using After Effects CS6 to convert the raw clips to prores HQ.
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Old May 2nd, 2016, 03:27 PM   #5
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Re: Jitter/Stutter when panning w/ BMPCC

Heres an example I found of what I'm experiencing.


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Old May 2nd, 2016, 03:59 PM   #6
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Re: Jitter/Stutter when panning w/ BMPCC

Try to follow following tutorial from Mattias, see if that makes any difference: (not sure if it autostarts the right moment but if not, you need to start watching from 06:10)

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Old May 2nd, 2016, 04:59 PM   #7
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Re: Jitter/Stutter when panning w/ BMPCC

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Originally Posted by Reggie Moser View Post
Heres an example I found of what I'm experiencing.


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That is not Judder, that is dropped frames. If my guess is right, when you single frame it, you will get one frame that shows the normal pan movement amount then the next frame will look like two frames have elapsed. Welcome to my world. I have an iMac 5K Retina display computer that does the same damn thing. After exhaustive research, since my graphics card does the rendering and playback, it must be my graphics card. I have spent a small fortune and all I end up with is Crap.
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Old May 2nd, 2016, 06:51 PM   #8
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Re: Jitter/Stutter when panning w/ BMPCC

Michael,
And I am about to buy the iMac 5k and was thinking it would clear up....I assumed going with the best 4g video card would alleviate the problem. But I guess the processor struggles to handle Raw data correctly.
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Old May 6th, 2016, 12:03 AM   #9
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Re: Jitter/Stutter when panning w/ BMPCC

I think the pan is a bit too speedy over and above the dropped frame issue. Kept wanting to grab it and slow it down by about 50%. Just my opinion.
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Old May 6th, 2016, 12:28 AM   #10
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Re: Jitter/Stutter when panning w/ BMPCC

Just a thought.............you HAVE turned OFF OIS on the camera before doing these pans, haven't you?

If you haven't, your chasing ghosts.


CS
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Old May 12th, 2016, 01:38 PM   #11
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Re: Jitter/Stutter when panning w/ BMPCC

I agree with Chris and Jim. That looks like image stabilization trying to keep stabilize the image and/or to fast a pan.
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Old May 12th, 2016, 03:06 PM   #12
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Re: Jitter/Stutter when panning w/ BMPCC

It's not certain he used a stabilized lens, furthermore he said that in pro res it played smoothly so it can't be a stabilization problem.
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Old May 15th, 2016, 06:00 AM   #13
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Re: Jitter/Stutter when panning w/ BMPCC

Agreed. It's something in the process of the raw conversion and playback rendering. Can't point out the bottleneck exactly as I have had no experience using AE and only rarely worked with raw files. Maybe the limitation of his CPU or hard drive's throughput.
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Old May 15th, 2016, 01:31 PM   #14
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Re: Jitter/Stutter when panning w/ BMPCC

Yes, that is another consideration that I've been looking into. I have discovered something that does seem to smooth out the problem. Shoot in 60P!
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Old May 26th, 2016, 07:01 PM   #15
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Re: Jitter/Stutter when panning w/ BMPCC

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Originally Posted by Wacharapong Chiowanich View Post
Agreed. It's something in the process of the raw conversion and playback rendering. Can't point out the bottleneck exactly as I have had no experience using AE and only rarely worked with raw files. Maybe the limitation of his CPU or hard drive's throughput.

I certainly agree with you here. I think its something in After Effects and the rendering process. Oh, and I didnt have OIS on.
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