Treating Interlaced Footage In Shake

[user_deleted]

I got some questions regarding interlaced footage in Shake. I have to say after reading the manual i got a little confused. In Chapter 6, there is a step-by-step process about how to set up your script to use interlaced images but i need some clarification for each step.

Step 1: Set the deInterlacing parameter of each FileIn node

I am not sure what effect this has. Does it mean that setting this parameter to anything other then none, Shake will actually deinterlace the footage? Or is it just to tell Shake what format the footage is in, so that it knows how to treat it (in which case the name "deInterlacing parameter" would be misleading)?

Step 2: Set the reTiming parameters of each FileIn node.

It tells me to set it to Convert. Ok, if i want to convert from one framerate to another, or from interlaced to non-interlaced i can understand this. But what if i just want to keep the footage interlaced? Is it not enough to set the global render controls to field rendering?

Step 3: Set the Inc parameter in the Time Bar to 0,5. .. This allows you to eliminate the blurring caused by overlapping fields.

Is the inc parameter not strictly for viewing purposes? Does it influence how filters/transforms are applied? I thought it only gives me the ability to step through the footage from field to field, nothing else.

Thanks alot.

[user_deleted]

ok, here's the way i understand it.

what the de-interlacing parameter on the sfileIn node does is deinterlace interlaced footage.
how it does this is it duplicates every alternate scanline on every field. so essentially you land up with two full resolution images in each field. in stead of two half resolution images in each field. this will allow you to transform your footage (scale it up or move it) without screwing up the interlacing. if you moved the footage up one pixel for example you'd reverse the interlacing. it also steps around the thorny issue of aspect ratio's blah blah blah.

if you plan to output interlaced footage at the same speed that you're bringing it in you don't need to retime. retime is important when changing the speed of your clip, say going to NTSC from PAL, or when going to progressive frames.

the increment parameter is for veiwing indeed but it can help when you to track down odd artifacts. It is also essential for rotoscoping or paint.

you only set your globals to interlaced right at the end, just before rendering your final output.

[user_deleted]

Thanks alot for your reply.