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motion tracking trouble in 24p
I’m trying to track the motion of some standard def, 24p, NTSC video shot on a Canon XL2 using After Effects 6.5. Even though my track point follows the footage extremely closely, applying its motion to a null object causes the object to jump around more than the track point ever did. Does anyone know if this is a result of working with 24p footage, non-HD footage, or a little bit of each? I tried to attach a null object to some 30fps footage and that seemed a bit smoother. I’d really appreciate any and all help.
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4 Replies
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In case you didn’t know, 24p video footage, out of the camera, is actually 29.97. That is, pulldown has been added, creating interlaced video. You should consider removing pulldown (file>interpret footage>main) before doing the tracking, so you’ll be working with full frames at 23.976 fps in a 23.976 fps comp.
Let us know if that worked.
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I forgot to mention, but I’ve already applied pulldown and am working in a true 24fps workspace.
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Yeah, AE is pretty anal about 24/23.98/23.976.
If it’s video or telecined film, it’s 23.976, since:
30 X 0.8 = 24
29.97 X 0.8 = 23.976Anyway, try out Dave’s recommendations. Let us know.
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Wow, good call, turns out I did have it in 24fps instead of 23.976. Now it works like a charm. Thanks a bunch!!!
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