I've been having some major trouble exporting a QT reference the last few days.  I had been working in this project for months, and have exported sequences just fine, but all of a sudden, after no changes to my project, the QT references are loaded with scan problems.  I'm trying to eventually burn this to DVD, and have tried numerous workarounds, but can't seem to fix the problem.  I've included a screenshot of what the issue looks like.

Any suggestions?  Thank you.

Might have the field order reversed but it's hard to say without any details from you.  What was your source material?  What are your export settings?  How are you going to burn the DVD?  Have you tried looking at the output on a interlaced display (like a TV)?

Source material is DVCAM imported at DV25 411.  Exporting QT reference files in 16:9 that will eventually go into Compressor to be encoded as an mpeg-2, but I can't get that far due to the error.  I've tried exporting as a QT movie (h.264, DV,/DVCPro animation, but they all produce a more wavy-like effect, rather than the one showed in the screenshot). DVD will be burned in DVD Studio Pro.  I haven't watched it on interlaced TV, but it seems to work fine when you play the burned DVD back on the Mac.

DId you try it with the Avid DV codec checked on export?

Since this is DV 411 footage, you must check use Avid DV codec in the QT ref settings. This will keep it at 720x480 and not stretch to 720x486.

EDIT: BLKDOG beat me to it.

Oh wow.  I think that might have done the trick.  I'm not sure why it only started to do this recently (since I don't recall ever setting it to the Avid DV codec before), but the lines are definitely gone.  Much thanks to the two of you.

On a sort of unrelated note, I've always exported QT references in 16:9 instead of native.  Does it matter at which point I unstretch the material?  My workflow, for instance, is Avid -> Compressor -> DVD Studio Pro.  Should I export out of Avid in native, or does it not really matter?

Thanks again.