Generally DV can only store fields however splitting progressive footage into fields does not create interlaced footage and does not require adaptive de-interlacing to get it back to the original frames. Simply change the media's flag in Vegas to None(Progressive) and Vegas will merge the fields back to the original frames.
If the source is 24p and requires pulldown to fit into 60i then using the Advanced pulldown option means the pulldown can be completely removed. That said I think Vegas will write a DV AVI file that's 24p. The problem is when you read it back because the file spec lacks a progressive flag Vegas will read it as interlaced even though it isn't. Again just change the media's properties and the problem is solved.

Just as an aside if you ever do need an adaptive de-interlacer Mike Crash's Adaptive De-interlacer plugin for Vegas is free and works very well once you figure it out.

Bob.

Thanks for good explanation and tip about Mike Crash Smart Deinterlace filter, i didn't know about it... will try!
But only one more thing about fields - how's that Vegas 9 gives me one interlace info and for example Procoder gives different info about input file on field order?
if program reads this info incorrectly, how should i act? use Mike Crash filter to be sure?


Aivar

"if program reads this info incorrectly, how should i act? use Mike Crash filter to be sure?"

Set your preview monitor to Best/Full. Turn off Scaling. Check where there's plenty of motion. If you don't see any interlaced combing then the footage is Progressive regardless of what Vegas might try to tell you. Change the media's properties to Progressive, no need to do anything else.

To be honest unless I shot it myself I never trust what any software thinks the footage might be. Vegas does seem to have some issues reading flags but even so, trust nothing. Same goes for field order with interlaced footage.


Bob.

I have problem. my input .mp4 is in progressive field order and i wanted to covert it into DV.

My first impression was that you were doing this for delivery, not just your personal use.

It is important to make the distinction between the DV-AVI format and the codec. Of course one can render dvsd progressive, probably even 24p w/pulldown, but then it is not DV-AVI. A client asking for DV-AVI delivery (suitable for tape, for instance), would not get what they asked for. This is an important distinction if anyone but you will be looking at the files.

DV-AVI, as a tape-based delivery format, is interlaced. Rendering as Progressive and / or changing the frame rate (or resolution) from NTSC or PAL specs makes it "not" DV-AVI any more, but something else that was rendered using the DV codec.