Taking progressive material to interlaced

M

Mark Seibert

Well-known member
Hey All,

I have footage recorded at 30 fps progressive scan square pixels for playback on a PC. It looks great there, but I've been asked to put this on an SD DVD. When I render this as a DVD architect format (Or even preview it as such) I start seeing a LOT of tearing due to interlacing on the big camera moves. What settings should I be using to eliminate or at least minimize this problem?
 
Hey, I think that actually IS better. I guess the real test will be for me to burn it onto a DVD and take a look. Thanks for the suggestion :)
 
You won't see the interlacing on a standard TV.

However, you shouldn't be getting those kinds of artifacts unless you're cutting between fields made from the same frame. To elimate this problem, I suggest cutting on a 30p timeline -- 29.97 progressive instead of an NTSC DV timeline, with the deinterlace method set to "blend fields."
 
Hi David, thanks for chiming in here. So let me make sure that I understand what you are saying. My source material is not interlaced. In spite of that, you are recommending that I set the deinterlace method to blend fields?
 
Bump - Can you explain what blend fields does in this context? I have always thought that helped in going from interlaced to progressive - blending the lines together to help the tearing. But if I'm going from Progressive to Interlaced, what does this do for me?
 
What it does (at least in theory) is keep you, while you're editing, from making a cut between two 60i fields which come from the same 30p frame. This SHOULD make it so that when you render out as interlaced, all of your "frames" (frame 1, odd/even fields, frame 2, odd/even fields, etc.) are made up of fields from the same 30p frame, thus alleviating your problem.
 
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