Strobing MPEG2 from Vegas

Malcolm D wrote on 11/2/2006, 1:39 AM
Hello
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?

Comments

farss wrote on 11/2/2006, 4:21 AM
I think this might do better in the video forum!

But since we're here.

I assume by strobing you mean jerky motion?

If so then this is almost certaibly the old reversed field order problem. It'll look fine on a LCD monitor and terrible on a CRT. I helped out one guy who'd been given his vid back from FCP as 5 x QT files, 3 of them had the field order flagged the wrong way around and he didn't find out until after duplication, ouch!

PAL DV is LFF, PAL is UFF (called PAL Standard in Vegas), so you can see how chaos, confusion and general mayhem can set in.

I trust nothing from other NLEs, I always check the files out on an external CRT monitor before encoding, I've found quite a few with it wrong.

Bob.