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De-interlace advice
Hi all:
I am finishing up an edit for a project that was shot on two DVX-100a camcorders. Mini DV obviously. One was shot 30p and it appears that the second angle was shot interlaced. Cutting between the two looks rather strange as one angle has the softer progressive look from the 30p, while the other angle looks “live”.
I want to de-interlace the interlaced camera angle to get the clips to match better. When I apply FCP’s de-interlace filter, the overall look is closer but I notice pretty nasty aliasing with stair-stepping. Didn’t there used to be a trick with duplicating the video track, then applying the de-interlace filter to both, one with upper field order first, then one with lower, then combining them somehow? Is this ringing a bell? Are there other, better ways to de-interlace without going out to Compressor? This show has a ton of clips and everything is already cut so I would rather not have to take all of the clips out of FCP, if possible. Any advice for me? Someone mentioned that DVDSP has a de-interlace feature so in theory, when the client authors the DVD, he could de-interlace? Would that mess up the 30p clips though since they are already de-interlaced?
G5 Dual 2.3
4GB RAM
FCP 5.1.4
QT 7.2
DV material
Final output DVDThanks,
Dan
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2 Replies
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[Dan Brockett] ” Didn’t there used to be a trick with duplicating the video track, then applying the de-interlace filter to both, one with upper field order first, then one with lower, then combining them somehow?”
You’re refering to this: Duplicate the video as de-interlace as you suggest, then set the top layer opacity to 50%. It’s not bad, but it’s not progressive. There are numerous other de-interlacing filters around – some better than others. Some, like the one in the CGM set use ‘smart’ deinterlacing (doesn’t Natress one do that?) which uses a motion detecting algorithm to ‘blend’ the fields. You’ll still struggle to get a great match – but you can improve on the FCP one.
Ben
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Hi Ben:
Thanks for the response. I dug around some more and it seems that there are as many recipes for this as there are for Apple pie. I experimented and did some tests and it seems that 30p, with it’s “half interlaced/half progressive look” seems to be a little bit different than if I were cutting against 24p looking video.
The recipe that is giving me tbe closest look is to duplicate the layers, add de-interlace filter on lower layer and put 30% opacity on upper. Doesn’t match exactly but it’s a lot closer.
I should check out Graham’s filters, I have heard nothing but great things about them.
Thanks for your help,
Dan
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