If you are keying with interlace video (not progressive), when there's some fast movement in your video, most of the time, the key look awful during the movement.
One easy way to deal with this is, Deinterlace you chromakey footage first, then do your key. Remember to Deinterlace your background clip and other layers as well. If the other sources is progressive, just repeat each frame to 2 frames. After the compositing done, Interlace it back to normal.
This technique can be used in any machines like FCP, eQ, AF, Shake, Digifusion, Avid, as long as they can do DeInterlace, it works.
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