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Interlace Combing – Arrgh!
Hi all –
We use the Panasonic SDX-900 often to film 24p DVCPRO50 footage. We capture with a DVCPRO deck to an AJA Kona3 in DV50 and edit on a 10-bit Uncompressed FCP timeline.
Problem:
When watching the footage back in FCP, there’s an insane amount of interlace combing on everything that moves. It really shows up on a progressive monitor and a little on an NTSC monitor. When watching the footage in Quicktime it looks fine.Deinterlacing when exporting gets rid of the combing but it cuts resolution by half and makes text and titles look bad – so that’s not an option for me.
Any ideas as to what we’re doing wrong? We’re using both DV50 and 10-bit Uncompressed timeline settings.
Thanks so much ahead of time for your help!
Dan
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8 Replies
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I watch SDX900 footage often and don’t see this.
Are you sure you aren’t watching too close? What kind of progressive monitor? A lot of progressive monitors are horrible as displaying interlaced images, horrible in SD in general. Can you post a sample? Did you shoot 24p or 24pA?
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Daniel,
When cutting on a 24p timeline change the View–Video Playback settings to a 29.97 setting and see if that solves your problem. My deinterlacing you’re actuallly changing the video, the way I’m suggesting only makes it display properly on your monitor without making any changes to the underlying video.
David
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY™
A forum host of Creative COW’s Business & Marketing, and Indie Film & Documentary forums.
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So you’re mixing Uncompressed and DV50? They have different field orders (DV is upper, UC is lower). Try putting “Shift Fields” effect on one of the clips and see if that works….
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Thanks so much, everyone for your help. That was it, exactly. I changed the field dominance for the sequence and the combing went away.
Please forgive me if I sound ignorant with the following question. When I capture my progressive DVCPRO50 footage, I’m actually converting it to interlaced footage? I assume this because the DVCPRO50 and Uncompressed presets have field orders – if it really were progressive there would be no field order issues. Right?
Thanks again so much for all of your help!
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[Daniel Stone] “Please forgive me if I sound ignorant with the following question.”
Please. These forums exist to ask questions. Do not feel ignorant and ask whatever you want.
All ‘progressive’ material that is shot on to tape s stored in an interlace stream.
What did you change your field dominance from and to? FCP6 has been handling interlace differently.
Jeremy
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Got it! Thanks!
I changed from upper to lower field dominance.
So aside from the fact that it’s probably a waste, filming in DVCPRO50 – which is lower field dominance – and capturing in 10-bit Uncompressed – which is upper field dominance – is going to create field issues, right?
Thanks again very much for everyone’s help.
Dan
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[Daniel Stone] “and capturing in 10-bit Uncompressed – which is upper field dominance – is going to create field issues, right?”
10 bit is lower field first in NTSC. You should have no issues capturing dv50 to 10 bit. I do it all the time.
Jeremy
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Gotcha. Thanks!
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