A weird visual warble in my video...why?

K

k2director

Well-known member
I was doing some test shooting, and noticed a weird visual warble in some of the clips. You can see an example in this short clip here:

http://www.k2films.com/weird_warble.mov

Notice the lower right corner of the frame, where the Cinema Display ends. Do you see that weird vibration in the video, or "warble"? You can also see it in the black mesh of the chair on the left side of frame.

This vibration comes and goes throughout the test footage. Anyone know why? I would hate to see this happen in footage that counted!

Any help much appreciated...
 
Thanks for the reply, THoff. But can you elaborate a bit? I'm not sure what you meant by "wasn't treated as progressive during your workflow". I believe I shot the footage at 720/24p, and imported it into a FInal Cut sequence that's set for the same thing.

Or are you saying that I may not have been consistent between how I shot and the footage, and the kind of sequence I imported it into? Do you mean that I might have shot it at 60p but tried to capture into a 24p project? Or vice versa?

Any clarification would help, thanks much!
 
No, I'm saying that the video might have been treated as interlaced material at some point in the workflow.

Does this affect all of your video, or just this one clip?
 
Ah, my workflow was simply shoot the footage to the P2 card, and then capture it into Final Cut, and then play it.
It only happens in a couple of shots (the vast vast vast majority of my shots are free of it), and always when there are really blown out highlights...
 
You should turn off the AUTO setting for the KNEE if you are using it to prevent pumping as you hit the limit of what the camera considers too bright an image, but I've never seen it cause the kind of warble that is in your video.

On the other hand, I don't generally shoot a video monitor either, so maybe the refresh rate of the monitor causes things to oscillate somehow.
 
I saw that happen to footage on my DVX and I discovered that the automatic focus was causing it. Flick that off and you're golden.
 
Yea, actually the monitor itself was off, it just happened to be in the background of the shot. But I will look into the Knee setting, and see if that addresses the issue. Honestly, any footage that isn't super blown out looks great, so I've had no real-world problems yet, but want to understand what's happening nonetheless.

Anyway, thanks very much for the help....
 
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