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GH4 video judder/strobing - a solution

Started Nov 15, 2014 | Discussions thread
Jon555 Veteran Member • Posts: 7,721
Re: GH4 video judder/strobing - a solution

levisurfer wrote:

levisurfer wrote:

I am playing back the footage on an iMac 27 inch monitor ad comparing results also on a Dell monitor. I will copy the footage onto a USM pen and then watch on my Panasonic PAL TV to see if its is any better.

These are the results put onto a PAL timeline in FCP X.

https://youtu.be/Uyv2LA3wtsc

I don't know what FCP does to convert from 24p to 25p, in the broadcast world they'd just speed up the clip and slightly filter the audio to keep one output frame = one input frame, so no nasties.

There is a... "rule of thumb is to pan no faster than a full image width every seven seconds, otherwise judder will become too detrimental."
But you seem to be inside that. Are you shooting with a 180 degree shutter (i.e. 1/48 or 1/50) as a faster shutter will make things look worse?

P.S. A longer, even 360 degree, shutter should help, haven't tried it specifically for panning (just very low light work), but the day is young.

P.P.S I don't use FCP X (I'm using Resolve Studio) but have seen:
"You can try FCP X built-in optical flow smoothing. This requires slightly retiming the clip (which could be just 99% or 101%). Select clip then pick menu Modify->Retime->Custom Speed, and pick 99% or 101%. Then Modify->Retime->Video Quality->Optical Flow."

P.P.P.S. Should have included the Red link for the 7-second quote, which I've now found:
http://www.red.com/learn/red-101/camera-panning-speed

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Nikon Coolpix 950 Fujifilm FinePix Real 3D W3 Sony RX100 V Canon EOS 5DS R Panasonic GH5 +31 more
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