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Field Jitter Breakthrough!

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Mochegod
Field Jitter Breakthrough!
on May 7, 2006 at 2:34:34 pm

I have been having a major problem with field jitter when transcoding for DVD. It appears as a sort of stutter around any motion in the frame. I've read many posts in this and other forums regarding this, so I would like to share the solution I finally stumbled upon after a full day of testing.

I had been exporting my source from an Avid Xpress (Meridian) as a Quicktime MJPEG-A, 720 x 486, 29.97, even (lower) field dominant. After 6 hours of varying every parameter I could think of, in desparation I exported the source as odd (upper) field dominant. That was it!! I transcoded in Encore 2.0 at 8 Mbps CBR and the video quality was beautiful.

As far as I understand it, Avid's export settings refer to lower field is the same as "even" and upper field as "odd" (field 1 & 2; makes sense), so I'm not sure why this solution worked, or if it will work for other NLE's.

I should also mention that I set the export field order in 2 places: the main export dialog box, and the options - video settings box.





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John Cuevas
Re: Field Jitter Breakthrough!
on May 8, 2006 at 2:00:07 pm

I think most likely the problem wasn't that upper/lower was wrong, but that you were exporting at 486. DV is 480. I know that if I create a graphic for the Avid at 480 and import it, the fields will be reversed as it scales it into the 486 comp.

Try exporting at 480 lower field first, probably will solve your problem.




Johnny Cuevas, Editor
http://www.ckandco.net


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Mochegod
Re: Field Jitter Breakthrough!
on May 8, 2006 at 5:35:13 pm

We are not working with DV footage, rather we are capturing Beta SP via Avid's Meridian board set (2:1, 720x486). I would think that maintaining the native resolution throughout the workflow would be the way to go, but I'll give your suggestion a try and see what happens. Thanks John!



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John Cuevas
Re: Field Jitter Breakthrough!
on May 8, 2006 at 6:40:04 pm

It's not that you are working with DV footage, but that the DVD aspect ratio is 720x480, not 486.

Give it a try and see what happens...

cheers.

Johnny Cuevas, Editor
http://www.ckandco.net


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John Cuevas
Re: Field Jitter Breakthrough!
on May 8, 2006 at 6:56:36 pm

Sorry reread my first responcse and it should of read DVD not DV, see where the confusion came from...

Johnny Cuevas, Editor
http://www.ckandco.net


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Mochegod
Re: Field Jitter Breakthrough!
on May 8, 2006 at 7:22:20 pm

Eureka! Worked like a charm. Thanks again John!



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