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Motion jumping error

Posted: Sun, 6th Jun 2010, 4:59pm

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Crazy Director

Force: 1051 | Joined: 1st Jul 2008 | Posts: 40

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This is happening a lot.

I'm making a lot of fxs where people are moving.
The motion keeps jumping like time is playing up.
E.G. One frame someone is walking forwards the next they're standing still and then the next continuing walking.
It still happens on the rendered file.

Any suggestions,please?

Crazy Director
Posted: Sun, 6th Jun 2010, 6:42pm

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Axeman

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SuperUser

Sound like its possibly a glitch in the codec. What codec is the footage in when you import it into VisionLab, and what codec are you rendering to?
Posted: Sun, 6th Jun 2010, 8:37pm

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Fxhome Dude

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I've had this problem too. I've just had to work around it. What format are your videos in and what type of camera do you have?
Posted: Mon, 7th Jun 2010, 8:28am

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Simon K Jones

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FXhome Team Member

Are the frame jumps very different, or is it more like a constant back-and-forth?

If the latter, you've probably just got your field order set wrong in you project settings. When starting a project, if you've been using 'odd', try using 'even', or vice versa.
Posted: Mon, 7th Jun 2010, 12:49pm

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Fxhome Dude

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Tarn wrote:

Are the frame jumps very different, or is it more like a constant back-and-forth?
Totally random (for me). For example a video of one guy walking from one side to another and frame anywhere in the middle might portray him just starting to walk. It can be really annoying and mess up a video. I'll upload a video of the problem later.
Posted: Mon, 7th Jun 2010, 12:53pm

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Simon K Jones

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FXhome Team Member

Hm, that definitely sounds more like a codec issue, then. Some codecs aren't designed for random frame access, so can cause problems.
Posted: Tue, 8th Jun 2010, 12:49pm

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Fxhome Dude

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Tarn wrote:

Hm, that definitely sounds more like a codec issue, then. Some codecs aren't designed for random frame access, so can cause problems.
Random frame access? Anything that I could do about it? (different settings, scan method?)
Posted: Tue, 8th Jun 2010, 2:27pm

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Axeman

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SuperUser

Rating: +1

Yeah, convert your footage to a proper editing codec. Codecs with that sort of issue are intended for final delivery, NOT for editing, and are primarily MPEG variants (including h.264) these days. No form of mpeg is intended for editing.

Quicktime Animation, Pro Res, HDV, Cineform, are a few options for good intermediate codecs, though there are others as well.