Jerk before keyframe in pan/crop mode

Rain Mooder wrote on 5/15/2004, 9:54 AM
I'm working on proofing my video which contains a bunch of
ken-burns style photo pans and zooms using the Pan/Crop
event feature in 4.0e.

I have a lot of these (15 or so) and I've been checking each one
carefully before I finalize the project and I've noticed something
strange. Right at a keyframe that begins a pan with a slight
resize the result jumps down and to the right about 1.5 pixels,
this happens in the next keyframe and the third. The result is that
in 3 frames the image has jerked about 5 pixels and this is
BEFORE my programmed linear pan with 100 smooth starts to
take effect. It should be a very smooth pan but instead what I
have is a perceptable jerk that starts what becomes a nice
smooth pan.

I don't have two keyframes right next to each other to cause
this jerk. There are just two key frames in the whole event:
one that marks the beginning of the pan and at the end.

Lastly, during the "jerk" none of the Size/Center/Angle numbers
are changing so I don't know what my picture is moving.

I have resample set to "Best" and I have set video supersampling
to 6. The same jerk is still there.

Comments

JJKizak wrote on 5/17/2004, 8:12 AM
Try this:
In the pan/crop menu there is a section that says smoothness with
the default set to "1". Set that to "0" for the start keyframe and then also repeat again for the end keyframe. This will ensure that you have
the same motion from start to finish. Keep the keyframes set to linear and make sure they are set to the very end and start of the picture. You also might try the track motion instead of the pan/crop. Thats all I have.

JJK