Using SeperateFields in Avisynth

[poerschr]

Hello...


I am trying to find out the best possible way to encode an avi (Divx, 29.97 fps, interlaced) to DVD.

I am using avisynth to framserve to TMPGenc. Before developing at script, I check exactly what is going on in the fields to determine what to do with the avi. On this particular avi, I noticed that when the fields are separated (other than being squished) three things are happening: 1) no gaps between the lines are visible 2) each field is a direct copy of each other 3) slight bobbing up and down.

I am not sure what exactly to do with this video? Should I try to deinterlace it? And then slow the frame rate down to 23 fps (applying an inverse pulldown in TMPGenc)

I understand the relationship between IVTC and framerate (used for film). I also have done some PAL to SVCD (NTSC) conversion before. I took a 25 fps PAL source (which was originally sourced from NTSC televsion) and used telecide in avisynth and then slowed the framrate down to 23 fps. In TMPenc, I then applied the pulldown. This resulted in progressive video playing at 29 fps. It worked beautifully.

I am stumped with material sourced in 29.97 fps. What exactly is the relationship between interlaced and non-interlaced (progressive) and framerate?

Should I just leave it as is? Applying filters to each individual field and then weave them back together in avisynth? I would like to make the video progressive with a pulldown to maximize data.

Thank You for your help....

[tito13kfm]

I would keep interlaced and keep at 29.97fps.

I'm sure you could de-interlace and IVTC and run at 24fps.. but would this make the video look any better or would it more than likely screw it up? In my mind, if it ain't broke don't fix it.

And here is a guarantee for you "Every body else who responds will disagree with me"

[duhmez]

You said both felds are exact copies of each other. therefore you have a progressive stream.


Encode progressive. Of course you could encode interlaced and it will still play fine, but if both fields are the same, and there is no repeating pattern of frames (duplicates, look for them), then progressive is fine.

A q: What is the source? is it originally a film @ 24 fps, was it a tv show, what part of world is it from, is it a DV source or homemade video>

the more info the better on this one.