adjusting quicktime animation speed for keynote presentation

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adjusting quicktime animation speed for keynote presentation

I have a quicktime animation of a piston with a clear background.

The animation does one full revolution of the piston.

I want to :

- Create a much longer animation where the piston revolutions gets quicker and quicker. In other words I want a longer animation where the speed of the piston changes during the animation.

- I want to maintain the clear background.

I know I can adjust the frame speed in quicktime pro, but not sure how to make this into a longer animation with varying speeds as determined by me, and make the speed changes permeant.

Is there a program that allows me to do this, whilst maintaining quality of animation? If so, how?

With Thanks

MacBook Pro, Mac OS X (10.7.5)

Posted on Aug 24, 2013 7:30 AM

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Answer 1

Aug 24, 2013 8:44 AM in response to INDY-GO

QuickTime Player Pro can do this.

Lets assume your source video is 2 seconds long. You can copy/paste from the source and add to the original to make it as long as you wish. Let's now say your source is 10 seconds long. the video "repeats" during playback. You can scale the original to a longer audio track and then extract the new video track which will appear "slow motion".

Or you can "scale" the ten second video to a five second audio file to make the video track playback twice as fast. Scale it to a 1 second audio file and it's ten times as fast.

You can then "extract" the new video tracks (Movie Properties window) and join these new tracks into a new .mov file (QuickTime .mov files can have up to 99 tracks).

Your original source video track isn't altered so the transparency is maintained and nothing is converted to another format so it's very fast to do the work.

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