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50i slow motion


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#1 Vedran Rupich

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Posted 02 February 2006 - 12:55 PM

I have som footage shoot with 50i.
Slow-motion is required for some of these. I have read here how to do it in AE using
60i, can someone explain to me how I could convert my 50i to 50p and make a
nice slow-mo effect?
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#2 Phil Rhodes

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Posted 02 February 2006 - 04:47 PM

Hi,

I did it recently for a music promo using avisynth and virtualdub. If you search the forum for avisynth, it'll probably be one of the only matches.

Phil
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#3 Simon Wyndham

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Posted 02 February 2006 - 08:57 PM

Expensive method: Use Algolith to do a double framerate deinterlace.

Cheaper method: Use your NLE in progressive scan mode and slow down your interlace footage by 50%. It should then make a frame out of each field pass.

Or use Phils method.

Really cool slow motion: Use Algolith for a double framerate deinterlace of 50i footage, then use something like Twixtor to slow it down even more. Depending on your footage and how much swearing at Twixtor for distorting the picture you can take, you can often achieve very convincing 100fps style slow motion.
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#4 Thomas Worth

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Posted 03 February 2006 - 11:08 PM

First, read my article on slow motion and After Effects:

http://rarevision.co...slow_motion.php

If you want nice slow motion with 50i footage, my suggestion would be to deinterlace the footage and play it back at 50% of the original speed (e.g. 25p). This is easy to do in After Effects, and uses all REAL information in the picture (as opposed to Twixtor, which interpolates and usually introduces some strange "gloopiness"). After slowing down the motion 50%, you wouldn't notice much of a difference between playback at 25p or 50p. And at 50p, to get the same effect you would have to slow the footage 100%, or 100fps. At that rate you would be forced to use Twixtor or some other program, which will need to interpolate between frames. This is where you get the weird temporal motion artifacts.
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Rig Wheels Passport

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The Slider

Tai Audio

rebotnix Technologies

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