Thread: Comet Panstarrs
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Old 08-03-2013, 07:30 PM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Sydney
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Quote:
Originally Posted by tilbrook@rbe.ne View Post
Your video is delight to watch Marc!

Just beautiful.

If you don't mind me asking, how do you get the frames to run at that speed. I'm using windows movie maker and it will only do one sec intervals, makes the animation a bit clunky.

Cheers,

Justin.
Thanks Justin. When you have a limited number of frames to play with you have no choice but doing something called time warping or time remapping and you need a software that can handle that. The idea is to stretch the time and interpolate in between the key frames so you get a blend happening. Like combing a histogram by stretching. You end up with gaps that you need to fill in. You can also encode to an interleaved format such as MPEG to make playback smoother or use frame blending in the output format.

I added a snapshot of time remapping curve below. A straight line (constant slope) would be x1 speed. Any zero slope is a freeze frame. Negative slope is reverse playback. You define points that are keyframes in time and tweak the bezier handles to make a smooth transition. So in this case you have a freeze frame ramping up to x1 speed then it slows down at 3s then slightly slows to finish just before 10s.

Quote:
Originally Posted by gregbradley View Post
Thanks for the explanation Marc. I checked out Adobe Premiere Pro but it was very expensive. I take it you use that software for other work?

Greg.
Thanks Greg. Yes Adobe products are not cheap to get in but once you're in a subscription model they are very cheap. I usually spend between $500 and $600 per year for the whole Adobe suite. That's every single Adobe product. But I have been with the program since the mid 90s when they started on MACs and used them at work for the past 15yrs or so.
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Last edited by multiweb; 08-03-2013 at 08:28 PM. Reason: Added time remapping graph
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