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After importing the clips into Chromanator and tweaking the key until I was seeing a good clip in the workspace, I rendered to a DV/DVCPRO Quicktime codec. I then imported the render into Vegas to add a graphic tag on the 30 clip.
The chromakeyed subject in the video (a waist up shot of a company CEO) walks toward the camera a couple of steps and in doing so he "rocks" right and left somewhat. It's during this motion that the rendered chromakey "strobes" pretty badly in the final output to standard DV video.
At first I thought it might be a field order issue, but it was rendered at the standard DV/NTSC "lower field first". But, I tried upper field first as well as progressive and all of them strobed quite a bit -- too much to use. I even tried a Windows uncompressed AVI as an output format and I get the same "strobing" video when the subject moves from side to side.
I then used the Chromakey plugin that comes standard with Vegas and while the key isn't as good as Chromanator, the output is perfectly stable, with no strobing at all.
Anyone ever see this and have a suggestion as to how to get rid of the jitters?