Field reversal fix

johnmeyer wrote on 7/31/2008, 11:28 AM
In this thread:

Interlace Flicker

there was much discussion of how to cure a field reversal problem. I just had this happen to me as the result of using my old ATI Radeon 8500 DV capture card. I captured using the MainConcept DV codec, but for some reason the resulting video was top field first instead of the traditional BFF.

I tried to get a good encode for DVD and ended up trying four permutations where I changed the field order of each event, and then changing the field order in the render. This gave me:

clip tff; render bff
clip tff; render tff
clip bff; render bff
clip bff; render tff

Here's the reason for this post: the render field order did not matter; only the clip field order fixed the problem.

Conclusion: The field order you set for the clip (which Vegas sometimes does not recognize correctly) MUST be set correctly, and must be set for the either the media (the easier place to set it) or for each event. The field settings for the project or for the render will not fix a field order problem.

Comments

farss wrote on 7/31/2008, 2:11 PM
The field settings for the project or for the render will not fix a field order problem."

Indeed. Because no matter what you do everything down stream will be based on the flags in the media.

Bob.
JohnnyRoy wrote on 7/31/2008, 2:53 PM
Excellent piece of work. Sometimes the best answer is to just try all of the possible combinations and see what happens. Thanks for taking the time John 'cuz you sure saved us time down the line.

~jr
johnmeyer wrote on 7/31/2008, 6:27 PM
JohnnyRoy:

You're welcome. This issue has come up several times other than the one a few days ago, and very few people seem to know about the field setting in the media/event properties dialog, and yet, based on these tests, that's the only one which will fix the problem.
farss wrote on 7/31/2008, 7:36 PM
It's also one reason I'll alway have a CRT hooked up and check for field order problems when I'm handling files from clients that I haven't worked with before. Once I had to wrangle a major stuff up with 5 QT files that cost someone a lot of money. Three of the 5 had the field order flagged incorrectly.

Bob.