Premiere 6.0 : zooming in over 10s

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Premiere 6.0 : zooming in over 10s

Postby Wyverex » Sat Nov 23, 2002 5:46 pm

I'm trying to zoom in a 10s-long sequence using the motion setting in Premiere but a setting of 100%->105% over 10 seconds makes the screen shaking... Is there any way I can avoid this? I tried image panning, cropping, camera view and even basic 3D effects but all of this still shakes the screen the same way.
I also tried After Effects but I still don't understand anything about it ^_^.

I'm using a high resolution (832x464) and that shaking problem is really annoying...
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Postby Eek-1 » Sat Nov 23, 2002 6:49 pm

(As far as I know) there's no way to avoid shaking when you zooming over 100%. 95% to 100% is OK.
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Postby Eek-1 » Sat Nov 23, 2002 7:01 pm

You can try this, see if my idea could work:

Create a separate project, set the video dimension to 874 x 488.
Import your clip and apply zoom from 95% - 100%.
Open timeline export dialogue box, only crop the video:

' upper-left: x=21, y=12
' lower-right: x=853, y=476

(that should make the output 832 x 464)

Export. After that import the new .avi into your current project.
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Postby klinky » Sat Nov 23, 2002 8:03 pm

You can try the image pan tool. Just keyframe the bastard...

Zooming really slowly seems like a bad idea to moi though :\

Also if the resolution is higher then the project, it shouldn't cause a jitter or ugly artifacts since it should be resampling from the hi-res image to the lower res project settings.


~klinky
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Postby klinky » Sat Nov 23, 2002 8:11 pm

Also if you think about it. Zooming a 832x464 @ 105% = 873x487. That is a horizontal difference of 41 extra pixels. Now assuming you're editing at 24fps * 10seconds = 240frames. Now you divide that by the number of pixels you have available to zoom, which is 41. That = 5.85, now you can't have fractional frames really, it has to put it on one or the other. So it would probably round it up to 6, or maybe down to five.

Either way! The idea here is that it's only going to move in 1pixel every 5 or 6frames. Which will be jarring and is most likely going to cause jitter.

That could be a reason why it looks bad.

Maybe I am speaking baloney as well :roll: :roll: Who knows.


~klinky
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Postby Wyverex » Sun Nov 24, 2002 6:59 am

Wheee! Done!

You'll never guess how I made it working...
I zoomed it 95%->100% but there were of course black parts around the edges. So I exported the clip in HuffYUV, imported it in the timeline again and set a constant 130% zoom using the motion setting to wipe out the black parts (don't ask me why 130%, I just played around with the settings).

So thanks to ek1. And to klinky who avoid me giving ek1's second idea a shot ^_^.
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Postby Wyverex » Sun Nov 24, 2002 7:02 am

That should get mentionned in a guide :D.
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