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Wiggly lines?….
Hello everyone,
I am using a Canon XL1 SD camera with FCPX 10.0.3. I have done a recent shot in a brewery and I have noticed that a lot of the horizontal and slightly diagonal lines (plumbing pipes, railings, etc.) are wiggly in the final movie. Also a diagonal line looks like a stair-step on a pull-out shot. Everything else is fine (people, verticle lines, etc). Is this interlacing? Is there a step, setting/filter to help resolve this?
Also, is it normal to have a wiggly border on the very edge around the original footage clips? I had to crop in 3% to get the edges to be sharp. Maybe this detail will help offer a clue?
Any help/thoughts are appreciated. Thank you for your time.
~Shea A.J. Comfort
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5 Replies
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Hmmmm… Standard def. Gotta love it.
I’m wondering. Do you see the jaggies when you’re editing? What about the output?
And when you’re editing, what is the size of the viewer window? Are you viewing clips at 100%?
Is your project the same format as the clips?I just tried bringing some dv footage into a project, and I didn’t notice any bad jagged edges.
I would expect if the project is the same format as the footage, that any jagged edges you see won’t be visible in the final product, if it’s going to be watched on a tv set. Try a test, and see if the final output is what you would expect.
If you are delivering for the web, you may want to do some deinterlacing.
Anyone else have any advice?
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Don’t live your life in a secondary storyline.Mark Morache
FCPX/FCP7/Xpri/Avid
Evening Magazine,Seattle, WA
https://fcpx.wordpress.com -
It sounds to me like you have your field dominance wrong. If that’s the case, deinterlacing it wouldn’t help, you need to go into the project settings.
Make sure when checking for this that you’re playing video back at full quality and 100% of size.
Does the same shot look fine if you open up the raw file in quicktime (make sure to play back at “Actual Size”)?
Is your source footage 60i? How is your project set up?
SD is usually lower field dominant I believe, so probably what you’ll need to do is set your project to interlaced with lower field, then deinterlace taking away the upper field.
It’s been awhile since I’ve worked with interlaced footage, so someone please let us know if I have this confused.
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This to me sounds like the usual aliasing issues that you get with DV recordings.
Its pretty much a “feature” of the DV format. It can usally be seen pretty clearly on shots that contain thin horitontal or near horitontal lines which is why things like like buildings, fences, roof tiles, pipes etc etc will generally suffer.
[Loren Risker] “SD is usually lower field dominant I believe, so probably what you’ll need to do is set your project to interlaced with lower field, then deinterlace taking away the upper field.”
This is not quite accurate. DV/HDV is the only format that is lower field dominant not SD in general. So it does hold true in your case but does not apply to all SD formats.
Removing a field wont help because you will just halve the horitontal resolution which if anything will make it worse.
I think Boris have or had a “DV Fixer” plug in that may help – I have not used it though so not sure how good it is.
best wishes
Neil
http://www.patience.tv -
Thanks for the responses.
It looks like everything is set correctly in FCPX. I have done some quick tests and have noticed that along with the wiggly line the entire image quality is lowered as soon as you crop 2%… It actually looks like a low-level gauze or soft-focus filtre. Unselect crop in inspector and the clarity is back and the lines are not wiggly…
The original file that made me catch this was exported from within FCPX, using the «export using compressor/YouTube 720p HD» setting. The same degradation of the file within FCPX (post-cropping) did come through in the final output file, unfortunately.
I am now doing tests to see if this holds true on export for other settings.
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One trick to see if the field dominance is correct is to step through your clip or sequence field by field.
In FCPX, you can hold down the option key and press the right arrow key to step through a field at a time.
Find part of a scene where there’s some motion. Stepping through the scene field by field, you should see the motion progressing in a constant direction. If the field dominance isn’t correct, the motion will step backwards/forwards/backwards/forwards.
If you must deinterlace, you don’t need to halve the resolution. There are different schemes of deinterlacing. It’s not ideal, but it’s not bad.
Good luck.
———
Don’t live your life in a secondary storyline.Mark Morache
FCPX/FCP7/Xpri/Avid
Evening Magazine,Seattle, WA
https://fcpx.wordpress.com
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