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Retiming - how can i improve?

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NickM
Retiming - how can i improve?
on Nov 18, 2007 at 8:37:41 am

Hi, All.

i've tried to do a re-time in Motion - noting more than a simple 50% speed.

Optical Flow has given me some problems.
it's creation of new frames isn't perect yet.
in particular it;s having trouble with areas of detail:
a moving hand to be specific.

and while Optical flow it better than a simple blend, i'm surprised it isn't THAT much better.
maybe its the footage: there's a fair amount of motion blur on the action already

i'm not expecting miracles.
when i did a test with Twixtor about 5 years ago i noticed the same problems.
(with moving hands)

but what would it take to get better results?

one option i have is to cut and paste frames of the moving hand to re-build it.
the 50% section is only 18 frames, and of those, only about 8 are bad.
but what other options are there?

other software?
expert Motion "tricks"? - shutter angle is a setting i saw and don't understand yet


here's some examples:

EXAMPLE 01a - FCP BLEND


EXAMPLE 01b - MOTION FLOW majority better than FCP BLEND, but moving hand (lower hand) has issues


EXAMPLE 02b - FLOW notice "6th finger" mutation on moving hand



tia for any info,
nick



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Noah Kadner
Re: Retiming - how can i improve?
on Nov 18, 2007 at 6:30:40 pm

have you considered Shake?

-Noah

Unlock the secrets of the DVX100, Apple Color and now the HVX200!
http://www.callboxlive.com


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specialcase
Re: Retiming - how can i improve?
on Nov 18, 2007 at 11:05:47 pm

Howdy,

Off-the-shelf Shake won't provide a better result, as it uses the same optical flow (OF) tech as Motion and Compressor. This sort of artifacting is pretty typical for OF, as the algorithms can get spoofed by fast lateral motion, and they don't necessarily understand the idea of foreground versus background objects.

Some apps, like Realviz's Retimer, have tools that permit you to manually correct the individual motion vectors, allowing you to avoid some artifacting. The latest version of Foundry's Furnace plugins (which can be run in Shake) have a new motion estimation engine that is supposed to do a much better job at fixing this kind of "drag" where a faster-moving object pulls along pixels from nearby, but slower, objects.


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Noah Kadner
Re: Retiming - how can i improve?
on Nov 19, 2007 at 5:36:36 am

Shake has a few more tricks up its sleeve on retiming, but yeah Retimer is best. Even better is you rent an HVX200 or a Phantom for super slo-moand shoot proper slow motion with more frames captured during shooting.

Noah

Unlock the secrets of the DVX100, Apple Color and now the HVX200!
http://www.callboxlive.com


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