HELP: Frame order interlaced!??!

Kevin R wrote on 6/30/2010, 3:52 AM
I have an old DV clip I rendered in 2002 that jitters badly. I discovered the frame order (not the fields) are interlaced as follows:

1-3-2-4

This was probably Vegas 5 or 6 back then. Anyone ever see this?? Anyone know how to correct this? Seems I might have to write my own effect filter! Anyone have any basic effect source code to start with?

Comments

Kevin R wrote on 6/30/2010, 5:44 AM
It's even more strange than I thought. The frame order appears to be:

1 - 3 - 2 - 4 - (3a) - (6a) - 5 - 7 - 6 - 8 - (7a) - (10a) - 9 - 11 - 10 - 12

The (#a) frames seem to be duplicates of their corresponding # (or extremely near duplicate), thus the sequence seems to be four interleaved frames, skip two, four more, skip two, etc... Very odd, and the strangest part is I remember this video playing okay previously.
TheHappyFriar wrote on 6/30/2010, 6:49 AM
looks like it's playback speed is messed up somehow. Does it play like that in media player?
Kevin R wrote on 6/30/2010, 7:29 AM
>>Does it play like that in media player?

Yep. It's baked-in to my DV-AVI render from way back in 2002. I doubt that I have the original assets to re-render, not to mention if the Vegas 5 (or older?) project file will even open in V9.

I can't imagine how that happened unless there was a bug in some old Vegas version. When you step along the time line the movement jitters back and forth.

Wondering if I could write a simple FX filter to re-arrange frames. Probably would be a three day chore (or longer).
JohnnyRoy wrote on 6/30/2010, 8:54 AM
> Wondering if I could write a simple FX filter to re-arrange frames. Probably would be a three day chore (or longer).

It might be easier to export the video as an image sequence and then just rename the images into the correct order and import them back in.

~jr
Kevin R wrote on 6/30/2010, 9:28 AM
Hmmmm... that sounds easy enough. 5 minutes x 60 sec x 30 fps = 9000 images. I could write a program to rename 9000 image files very quickly, assuming the interleaving pattern doesn't vary. Great idea!
FilmingPhotoGuy wrote on 6/30/2010, 11:47 AM
A similar question from me.

I finally ripped my VHS home movies to MPG. Before burning to DVD, how do I know if they are interlaced or what field order it is in? The card I used only has PAL or NTSC setting and ripps it to MPG format.
TheHappyFriar wrote on 6/30/2010, 12:11 PM
if you're going straight to DVD w/o adding any other footage, or editing just that footage, it won't matter, it should look fine.

But all mpeg capture cards I've seen have the field order reversed.
Former user wrote on 6/30/2010, 12:22 PM
The Happy Friar,

Do you mean Upper Field as opposed to reversed?

Many MPEG cards capture as upper field first.

Dave T2
TheHappyFriar wrote on 6/30/2010, 1:33 PM
Yes. DV is lower field, which is what most NLE's base the presets on.