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Overcranking video?


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#1 Douglas Sunlin

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Posted 18 July 2007 - 03:13 PM

Is it possible to overcrank a video camera (XL2 for instance) to achieve a slo-mo effect?

If the only solution is to tweak it in post, then what would be the best mode to shoot the shot in? 60i?
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#2 Phil Rhodes

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Posted 18 July 2007 - 03:40 PM

1) No. Video cameras capable of overcranking are still rare, especially at the XL2 sort of level. If it was possible, it'd be shouting about it.

2) Probably, yes. Shooting at 60i will allow you to perform a bob-deinterlace in something like Virtualdub. This sacrifices half the vertical resolution since it extrapolates an entire frame from each field, but gets you up to 60 real frames per second.

If you want to go faster than that, you will have to either use a different camera, or an interpolator such as MotionPerfect (cheap and basic) or Twixtor (expensive but good).

Phil
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#3 Douglas Sunlin

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Posted 18 July 2007 - 06:35 PM

Thanks, MotionPerfect looks good if we decide to do slo-mo.
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#4 Jim Simon

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Posted 19 July 2007 - 10:16 PM

The Panasonic HVX200, somewhat near the XL2's price range, can both over and undercrank the video in HD modes.
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#5 Douglas Sunlin

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Posted 20 July 2007 - 12:06 PM

Thanks, I'm sorta stuck with the XL2, since that's all the camera shop rents out. However, for future reference, it's a good tip.
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#6 Gary Lemson

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Posted 27 July 2007 - 07:50 AM

The HVX-200 does do over and under. However, not exaclty like a film camera. It cannot be "cranked" during a take. The frame rate is set first, then you record the scene.

Edited by Gary Lemson, 27 July 2007 - 07:51 AM.

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#7 Douglas Sunlin

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Posted 27 July 2007 - 12:32 PM

The HVX-200 does do over and under. However, not exaclty like a film camera. It cannot be "cranked" during a take. The frame rate is set first, then you record the scene.

Of course, that's just an expression from the old days.
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