Track Motion speed quirk (or user errors)

qsnow1 wrote on 8/6/2006, 1:54 PM

I've been trying to figure this out for a while now and it just doesn't act like I expect for some reason...

I have 5 30s video clips placed on 5 different tracks. The camera on each clip has been zoomed out to shrink the clip size and I have also masked off the corners just to give it a slightly different look (rather than just a square).

I then have gone into the Track Motion function and set a keyframe at the beginning and ending of each clip on the timeline. At the beginning keyframe I have the TM off to the right of the TV View and the end keypoint is off to the left of the TV view.

I copied the keyframes for the TM to the other 4 clips to be sure that each of them are starting in the exact same place.

For my end result, what I was hoping for was a smooth scroll of each clip, one after the other, seperated about about .5 to 1 inch of space. What is actually happening tho, is that when the clip 'enters' the screen it seems to scroll very slowly - while it is in the middle of the screen it scrolls faster, and at the end it scrolls slow again. So for example, clip #2 starts out about .5inch behind clip one but as they scroll that distance goes to about 2 inches and then at the end clip #2 catches up (when clip 1 is slowing down) and actually starts to overlap it.

There are no other keyframes in track motion for each track other than the 2 I put on each one...

Any thoughts as to what my problem is? Hopefully it's something stupid :-)

Comments

jrazz wrote on 8/6/2006, 1:59 PM

You have several options for types of keyframes. Try changing the ones you have (linear) to smooth or one of the other options. Just so you know- smooth is not exactly what the name states. Play around and see what you come up with.
To change the keyframe, right click on it.

j razz

qsnow1 wrote on 8/6/2006, 2:15 PM

I forgot to mention it, but I did trying playing with those, but none of them seemed to have any effect of the motion process at all.

qsnow1 wrote on 8/6/2006, 2:24 PM

I take that back (kinda). Messing with those keyframming types does seem to effect it (I needed to expand the keyframe section of the track to see which ones I was really changing). I guess what I still dont understand - I would think that if they all have the same keyframe type (linear for example) that they should all stay in sync. I want a consistent motion speed from left to right for each of them instead of getting this yo-yo like effect on them.

Jim H wrote on 8/6/2006, 2:39 PM

Have you set smoothness to zero on each keyframe?

qsnow1 wrote on 8/6/2006, 3:01 PM

Fantastic!. Looking at my keyframes, my smoothness was the default (100). Changing it to 0 seems to have kept everything in sync! Now I need to do some research to see what that settings really doing so I can use it properly next time..

Many thanks.