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Problem when using stabilization

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Mahmood Al-Shafai
Problem when using stabilization
on May 15, 2017 at 10:51:39 am

Hello

I found an issue with fcpx when using the built-in Stabilization

I have a footage from my iPhone 6s recorded with FilMiC Pro 4K 100mbs 30fps transcoded to Prores 422 1080p

When I Stabilize the footage the motion in the video looks jittery
it duplicate the frames of the video and if I turn off the stabilization the video is smooth

Does anyone experienced this before ?

It would be nice if there's a solution to this other than purchasing plugins like LockAndLoad

P.S. Excuse my English


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John Rofrano
Re: Problem when using stabilization
on May 16, 2017 at 2:44:35 am

[Mahmood Al-Shafai] "...recorded with FilMiC Pro 4K 100mbs 30fps transcoded to Prores 422 1080p"
I believe this may be your problem. Is FilMiC Pro recording at 30.0 fps and ProRes 422 using 29.97 fps? You want to stabilize the original source footage to make sure that nothing in the transcoding is causing the problem unless you can guarantee that the transcoding is the exact fps as the source.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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Mahmood Al-Shafai
Re: Problem when using stabilization
on May 16, 2017 at 9:40:22 am

I'm pretty sure the problem is not related to transcoding because when I transcoded my footage I haven't changed the frame rate (Transcoded with EditReady)

I have tried Lock&Load Stablizer from Coremelt and the result is fantastic

I'm working in 24p timeline


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John Rofrano
Re: Problem when using stabilization
on May 16, 2017 at 11:13:10 am

Ok, as long as the frame rate hasn't changed it should work. Yea, Lock&Load really Rocks! I use it all the time over the built-in stabilizer. It gives much smoother results in difficult situations. Not sure why the build-in stabilize would be jittery although going from 30p to 24p does have it's own cadence that could be jittery but then you would see this with both stabilizers.

I wonder if Lock&Load is stabilizing the original 30p footage and the internal stabilizer is converting to 24p first and then stabilizing that? That would explain why it might be jittery because there is less temporal information to stabilize at 24p? (just a guess)

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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Mahmood Al-Shafai
Re: Problem when using stabilization
on May 16, 2017 at 11:25:09 am

I'll try to stablize the footage in 30p timeline and see how it goes


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Mahmood Al-Shafai
Re: Problem when using stabilization
on May 16, 2017 at 3:30:33 pm

I'm sorry it appears that my footage is NOT 30fps even though in FiLMiC Pro setting it's 30fps
(I'll contact them later about this)

from my observation

it seems that when the footage is 30fps(Recorded with standard iOS Camera app) the built-in stabilization will do the job (in 30 and 24 timeline)

but the problem is that my framerate footage is 29.98 and when I use the built-in stabilization the jittery
motion appears in a pattern like this

1 2 3 3 4 5 6 6 7 8 9 9

Tried the same footage(29.98fps) in different timelines (24 , 29.97 , 30) still same issue

Could it be that my framerate footage is not consistent ?


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John Rofrano
Re: Problem when using stabilization
on May 17, 2017 at 1:36:20 am

[Mahmood Al-Shafai] "Could it be that my framerate footage is not consistent ?"
That is a common problem with video from a smart phone but FiLMiC Pro is supposed to eliminate that problem. I guess not. ☹

Since Lock&Load is not affected that might be your only solution. It's a really nice stabilizer. I use it all the time.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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