I'm not sure if there is a control that smooths out those kinds of pans, but I've noticed the same thing. You might be able to get by the problem by moving the pan and crop frame farther off the screen. That way the acceleration and deceleration is done offscreen and it is up to full speed by the time it hits the video window.

JBJones

I've pulled my hair out for hours over that. My hairloss is your gain, however.

It's not in the keyframes. At the left of the pan/crop, there's a box enabled "smoothness". Turn that down to 0%. You'll get linear motion.

Somebody at SF should be shot for that one!

Shot for what? For leaving a control at a setting most people will at most times use? Or for leaving it up to you to at least read the control labels that are in the dialogue box?
We've had issues here over buttons that are so disguised or small that many people don't find them even when they know they're there (the handle for undocking docked windows is one example), but the smoothness control in pan/crop and track motion? Wake up, please. Look interested.
Tor

Vegas allows two kinds of control over the motion along the path you define using keyframes in Pan/Crop or Track Motion - spatial and temporal.

You set the spatial smoothness using the Hold/Linear/Fast/Slow/Smooth options for the keyframes to define the shape of the path - linear for a very angular path, smooth for a nice smooth curve drawn through your points, something like a spline.

You set the temporal smoothness, the way the speed the point moves along the path changes, using the Smoothness parameter.

Normally if one were emulating a rostrum camera type move within a still image one would want a nice smooth start from a standstill, accelerate as one moved across the scene and decelerate smoothly to a stop as one reached one's destination. This would be achieved with a Smoothness setting of 100% (the default).

But in your case where you just want the move to be at constant speed you can achieve it by setting the smoothness parameter to 0%. This will give you an instantaneaous aceleration to full speed at the start of the move and an instantaneous stop at the end - i.e. you will just see constant speed throughout the move.

Mark

Thanks TorS and Mark! Never even noticed the smoothness setting before. I've gotten used to using motion curves in 3d programs, but you could manulapite the keyframes with handles. Then when I went over to Video editing with Premeire they didn't have any motion curves so I got used being stuck with the mostly linear motion (which is why I don't use motion to much in Premiere!). Thanks!

MarkWWWW, thanks to your explanation I *finally* figured it out! I'm a dunce, but thank you, thank you.

Now...how do I change the smoothness from 100% to 0% for about 400 stills and 2-4 keyframes per still? Yes, already completed and mostly wrong :-(

Mark, I was asking about this months ago. Where were you then?! ;o) Thanks for the education!