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Problem Rendering Twixtor Output in AfterEffects CS5
Hi,
I have recently started working with AfterEffects and Twixtor – I am trying to create shot of a glacier flowing.
I started with 21 frames (taken once daily) with a Canon 50D of a large glacier in Greenland. The stills are 4752×3168. I imported the stills as a TIFF sequence and then I have simply applied TwixtorPro to the footage and slowed it down to 10%. The RAM Preview is pretty good, the glacier flows really smoothly – there are a few minor warps but nothing that can’t be fixed.
However when I actually render the video it looks nothing like the RAM preview – It is hugely warpy, not just in the areas where there were minor problems, but all over the frame.
Can anyone suggest where I might be going wrong?
Comp settings are HDTV 25,
Twixtor Input Frame rate = 25.000,
Twixtor Display = Twixtored Output,
Frame Interp = Motion Weighted Blend,
Warping = Inverse w/smart blend,Many thanks
Laurence Dyke
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5 Replies
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Hi Dave,
Many thanks for the suggestion,
Open GL is OFF for rendering. I have included two screen shots showing what the footage should look and what it looks like when rendered.
The other thing that is perhaps worth mentioning is that the warping only happens during the middle of the clip the start and end are both smooth and unaffected.
Cheers
Laurence
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Are you saying that your RAM preview is fine, but the final render isn’t?
Are you rendering at a different resolution than you’re previewing? That might explain why your RAM Preview is fine, but the render isn’t.– The Great Szalam
(The ‘Great’ stands for ‘Not So Great, in fact, Extremely Humble’)No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.
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usually i’d recommend rendering out higher than 10% and importing and re-rendering another slow pass, but you’ve done some extreme time lapse where objects travel a far distance in each frame.
You could try using an alternate source with unsharp, shadow/highlights bring down the highlights and add more saturation to help guide the frames and keyframe the twixtor settings.
If that fails, your only option left would be to try to hand guide the twixtored objects in vector mode.
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Hi Dave,
Nice as though it would be unfortunately reshooting is not an option – I am trying to make the most of a sequence of photos that were taken for scientific purposes.
I have tried your suggestion and it works very nicely – thanks for your help with that. It has given me something useable to work with.
I know what I am attempting sounds ambitious but I can’t help thinking that Twixtor should be able to handle it. The stills of the glacier are taken from over 4km away and the motion is ~30 metres a day. From one frame to the next the motion is very small and it is constant and in one uniform direction. I think Twixtor potentially has the capacity to handle it especially as the RAM preview is smooth and not warpy (viewed in full resolution). Any other suggestions gratefully received!
Many thanks
Laurence
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