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View Full Version : Rotoshape and Interlaced Footage

Kokosing
03-16-2006, 12:03 PM
Hi, I'm a little new at this. I have an interlaced shot where I'm trying to create a mask to block a new background element while someone walks in front of it. The person's walking fast enough to create quite a difference between the two fields. So when I look at the interlaced image, I have a clear outline of the person with a slightly ghosted image following on every other line.

I'm looking for a workflow to let me see what I'm really doing. I'm trying something like this:

Pass the file in out to two separate field nodes and then interlace them separately so I can see each field in full frame height. Then I can use these as reference for keyframing my rotoshape. But as I see it, Im still only able to keyframe once per frame, so I'm relying on Shake's field renderer to create appropriate keyframes for the second field. Am I heading in the right direction?

Thanks,

W
darsha
03-16-2006, 09:37 PM
The way i've solved this was by deinterlacing the image through the filein node's timing tab (if you're on shake 4) and reimport it in to a script. It takes a bit more time but you'll be working with high quality progressive images which i like best :D

To do this without deinterlacing to progressive images you can also use the filein node and switch down the botom to odd (for PAL) at the deinterlacing parameter. This will split the fields in the right order and places them at every half frame at the same height of the original image. In order to see them you must enter the value of 0.5 at the inc field right next to the control buttons, then if you use your left and right arrowkeys the time bar advances by half a frame. But make sure you turn on field rendering in the globals tab before rendering the fileout node so you'll get your interlaced images back.

Ok, i'm no expert at this (i'm still at highschool) but it worked for me and i hope it works for you. good luck
beaker
03-17-2006, 06:55 AM
Normally in the states, I take 29.97 footage, do a 3/2 pulldown, do all my fx work/painting in 24fps and then put it back to 29.97 with interlacing in the end. I'm guessing though your working with PAL, so I would just deinterlace like Darsha said and work on progressive frames.
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