Strobing on MPEG2 in Vegas 6

Malcolm D wrote on 11/2/2006, 7:52 PM
Hello
I accidently posted this in the Vegas Audio forum.
Thanks Bob for your reply over there. I did try changing field order on render but still got same effect.

A client brought me seven short films (2-7 mins) on a USB external drive to make into two DVD's. These were PAL AVI's from premiere I think.
I used Vegas 6 to convert each one to MPEG2 using PAL DVD template.
The first one seemed OK so I converted the rest and burnt to DVD using DVD Workshop 2 which is our normal authoring tool. No re-rendering was involved.
Most of the films had severe strobing effects such as I have only previously seen when trying to re-render MPEG2 files.
I then made a test disc rendering from my internal HDD using CBR 8MB, VBR 6-8MB one pass and two pass. I also tried reversing field order. For comparison I imported an AVI directly into DVDWS2 and let it render to MPEG2 at 8MB.
Only the DVDWS rendered file did not exhibit extreme strobing on the burnt disc.
As a result I completed the entire job by importing AVI's into DVDWS and letting it render the MPEGs.
Does anyone have any idea why this would occur using Vegas to render but not with DVDWS?

Comments

PeterWright wrote on 11/2/2006, 11:12 PM
The Default Template is one to lay down and avoid, but the PAL DVD Template should be ok - you could also try rendering using the DVDA Video Stream Template - try a short troublesome passage and see if it's any better.

You didn't mention what your setting was, but Best rendering quality can help - I always use this when rendering from HDV to SD Widesceen MPEG2.
farss wrote on 11/2/2006, 11:56 PM
Changing the field order on render will do nothing!

If you start with UFF and render to UFF the playing device will do the right thing
If you start with UFF and render to LFF the playing device will still do the right thing.
In neither of the above sceanrios have you changed the effective field order.

If you RClick the clip (event) properties and changed the flagged field order and then render THEN you will reverse the field order in the final render.

Hope I've explained that OK.

Bob.
Malcolm D wrote on 11/7/2006, 8:44 AM
Hi Bob
Right on thanks. Three of the clips had the wrong flag setting so I changed them in properties and they rendered ok.
Out of interest. I have always referred to odd and even fields until getting into NLE's. Which is upper and lower. If I assume this relates to screen position then odd would be upper. Is this correct?

Malcolm