I'm using FCP7. I'm trying to edit a cannon 5D footage (1080P).
Whenever I'm trying to change the motion/center of the clip by using key frames, its dropping the frames and giving a blurry interlaced type of output. I have done it so many times but never faced this problem before.
Progressive video has no field dominance. Check your sequence settings and be sure that the field dominance is none.
While you're at it, be sure your editing timebase is the correct, either 29.97 or 23.98. If you aren't sure it will be listed in the browser if you are using a list view, or you can select some of the media and hit butterfly-9, where it will be listed in the item properties.
[Himanshu Bhatnagar]"Browser have no details about the footage that it is prog or interlace."
have a look to the "Field-order" column in the Browser.
Your footage must show up as Upper, Lower or NONE>
NONE means PROGRESSIVE.
As Jeff points, be careful with the time-base.