interlace motion artifacts

[Kevin Camp]

[Jeremy Schoenwald] “smooth out some SD interlaced footage on the Y axis”

i’m not sure what that means… are you stabilizing footage on the y-axis?

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Curious Turtle]

Is the “slightly garbled motion” motion blur? If motion blur was recorded then stabilising or smoothing your footage will do nothing to remove it. In fact, stabilised footage with motion blur will look slightly odd because you’re seeing something associated with movement in a (now) static shot.

If that’s not the problem, you may have to expand your description (or post a picture).

Cheers,
Ben

Curious Turtle Professional Video
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http://www.curiousturtle.com
Need help with your planar tracking?: Rock Steady : Successful Motion Tracking in Mocha & After Effects & Tracked : The Art of Motion Tracking in Mocha for FCP

[Jeremy Schoenwald]

Yes, I’m attempting to stabilize the image. I have a 16×9 matte so I’m just stabilizing vertical shake. Unfortunately the issue is not really visible in an image. The image is clear when no adjustments are being made but when it starts making the adjustments I would describe it more as like a slight blur that seems to constantly be adjusting with the move. I get the same problem only a bit more extreme with keyframed motion adjustments in FCP. Motion blur is not enabled for the video track.

[Jeremy Schoenwald]

The footage was shot with an XL2 in 60i. My timelines are at 29.97. I captured in DV/DVCPRO – ntsc and that’s my output settings from AE too.

[Curious Turtle]

Without a picture, it’s still difficult to fully diagnose it.

When I said motion blur in my previous post, I meant motion blur that is present in the clip before you’ve done anything else. Not motion blur added in After Effects.

If you try to stabilise a shot with natural motion blur in it, then it will look odd when stabilised. There’s nothing you can do about it, except smooth the stabilisation out so it’s not stabile so the effect is not so noticeable.

Cheers,
Ben

Curious Turtle Professional Video
Training | Editing |Support

http://www.curiousturtle.com
Need help with your planar tracking?: Rock Steady : Successful Motion Tracking in Mocha & After Effects & Tracked : The Art of Motion Tracking in Mocha for FCP

[Jeremy Schoenwald]

Here’s a frame from a clip I tried to corrected this morning. Here is the frame before…

hy1a.png

and here is the frame after running it through AE

hy1b.png

There are two issues. 1) If you zoom in you’ll notice a definite blurring and it seems like a slight shift in placement (0.5 pixel down) 2) the color darkened after the export from AE.

Any thoughts?

[Jeremy Schoenwald]

Ok, I created another composition with two layers of the same clip with the top at 50%. One layer I interpreted as upper field dominance and the second as lower field dominance. The resulting clip is stable (its not drifting in and out of focus like before) but a softer blurry look. Would this indicate that its a motion blur issue or an interlacing issue? I think it would be the double fields that gives it a soft look, so I would want to get rid of one field and but at the same time avoid a de-interlaced stuttery look. Any suggestions?