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scaling causing strobing problems
Hello
I am editing a 4 screen video installation. In order to work on all the channels at once I have scaled them down to 24% and placed them side by side in a 4X1 arrangement. I notice that when I scale down a particular clip it causes an extreme strobing effect. I see this in my computer monitor as well as an NTSC viewing monitor.
The footage is a shot looking down a hallway at a door. The camera then zooms in to the door. During the zoom is when the strange strobing effect occurs.
No matter what I do I cannot seem to get rid of this problem. I have tried positioning the clip on an even number (86 x-axis, 0 y-axis), de-interlacing, flicker filter, adjusting the field dominance and changing the video processing settings.
The only thing that has slightly helped is changing the motion filtering quality to fastest (linear). This still does not get rid of the problem completely.
By the way this was all shot on DV using a VX2100 if that matters, though the original footage does not have this problem, just when it is resized.
If anyone has any advice it would be greatly appreciated.
thanks
Nikhil -
4 Replies
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Will your output be 24% from one playback device or 4x full screen on four different systems?
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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Actually it will probably be both. In the actual installation it will be synched and rear projected on 4 screens, but when I send documentation for review it will be at 24% on one screen.
I am currently applying for a grant and need to send documentation of this work for consideration. I want to make sure it looks as good as possible as they will be judging the work from the 24%/one screen setup.
Nikhil
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Okie dokie, but we still don’t know what format you’re working in or will be delivering.
Documentaion provided on DVD or via Internet will not benefit form any improvements.
This zoom move of yours that is causing so much trouble was apparently shot differently than everything else. I cannot tell from your description if it’s likely to be a simple interlacing issue or something terribly complicated. I’m guessing the clip was shot (or captured) as progressive.
About all we can do without actually seeing it.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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Hi bogiesan
Thanks for the help. It is possible that it as shot progressive, but I don’t have access to the camera anymore to verify that. As far as capturing it I can check after work. I did a little reading about shooting progressive on a VX2100 and I think you might be right. My problem seems like the shearing that the 8th post is talking about.
https://videomaker.com/community/forums/topic/shutter-speed-settings-for-vx2100
Is there anyway to salvage this footage or will I have to reshoot it?
The video will be delivered on DVD. Are you of the opinion that any adjustments I make will not translate to the final DVD? I do have a very small file of the problem if you were interested in taking a look. What is your preferred method of delivery. I have uploaded it to senduit.com if you want to take a look.
Nikhil
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