Interlaced movie help

[tatester]

I have an mpeg movie I want to re-encode which displays the horizontal interlacing lines every now and then especially when there are fast sequences, I dont have a problem with this, however when I re-encode it using tmpgenc and then put the file into an authoring package the picture is wobbly as opposed to showing the horizontal lines. It plays fine in media player but not when I put it into the authoring package. I've tried de-interlacing it in tmpgenc but this only produces the same results, I've even tried the file without re-encoding and it's the same.

Any tips on how to get rid of this would be appreciated.

Cheers!

[tatester]

I've been doing a little trial and error and the wobbly picture only occurs when I apply overscan borders using fitcd and use the avisynth script that it generates in tmpgenc. If I use the file directly it seems okay, I'm not sure if there's a way around this.

[manono]

Hi-

This thing is NTSC? If it's a movie, and it's showing interlacing, then most likely it's 29.97fps and should be IVTC'd and not deinterlaced. It can be neither IVTC'd nor deinterlaced if it's been resized and the original encoder didn't know what he was doing. If it's PAL, and a movie, then if you see interlacing, it most likely has shifted fields which can be straightened out with Telecide(Post=0) without ruining it by deinterlacing. But if the field structure has already been destroyed with improper resizing, it's good for only the recycle bin. So, what's the resolution of the source?

Assuming it's still good, you have to be careful when cropping and/or resizing interlaced sources, or all kinds of strange things can happen. You can only crop the height, both top and bottom, in multiples of 4, if the source is in the YV12 colorspace. I could be wrong, but I don't believe that FitCD crops/resizes taking into account interlaced sources.

http://www.avisynth.org/Crop

I'm not sure I'd trust a software player to play it correctly anyway. What do you mean it wobbles when put in an authoring package? Are you playing the completed DVD in a standalone sending to your TV set? Or are you using a different software player from inside the authoring package, like maybe the IFOEdit player? If so, I'd ignore it and test the result on your TV.

[Cornucopia]

No, that doesn't sound like it. Sounds more like the OP is resizing before deinterlacing. Then the mice teeth get magnified and it does shake a whole lot.

BTW, true 29.97 interlaced video should NEVER, EVER be IVTC'd!
Only original film sourced stuff (telecined from 24/23.976 progressive).

Scott

[guns1inger]

If you tick Interlaced in FitCD it will alter the script to resize correctly.

[manono]

Hi-

No, that doesn't sound like it. Sounds more like the OP is resizing before deinterlacing.

Yes, that would explain it, but deinterlacing before resizing is so basic that I didn't even consider it. Thanks for pointing that out.

BTW, true 29.97 interlaced video should NEVER, EVER be IVTC'd!

I did say "if it's a movie". Maybe I should have been even more specific and said "if it was shot on film".

If you tick Interlaced in FitCD it will alter the script to resize correctly.

I had done a quick check and hadn't seen it. Now, after looking more closely, I do see the check box, and it does make the necessary change. Thanks for the correction.

[guns1inger]

For some reason, the interlaced box is with the options for output, when in fact it designates interlaced source. Makes it's use a little less obvious

[tatester]

Cheers for all of the responses guys - I'll go away and see if get any better results

[tatester]

I tried the above method of checking the interlaced box in Fitcd and it worked, however when I put the movie on my stand alone dvd player the picture was quite shakey, I also tried the same dvd on my ps2 and it played far better. Also I realised when I encoded the movie in tmpgenc I had set the encode mode to non-interlace. Would this have affected the above results?

[guns1inger]

What field order did you set for the source ? It sounds like this may have been reversed along the way.

[tatester]

I had set the source field order to 'top field first (field A)', it defaults to that when you open the movie in tmpgenc. What's the best way to tell which field order to use?

[guns1inger]

Use DVDPatcher or Restream to change the order without re-encoding, and see which one works.