Rendering mpg to mpg =>motion becomes jittery

[mltwitz]

I'm rendering a project as DVD-compliant video in Sony Vegas 6 using the MainConcept MPEG encoder. The project consists of an interlaced clip from a DVD (ripped as .vob and then renamed to .mpg in order to import it in Vegas) and a de-interlaced divx file. When I watch the finished clip on my PC it looks perfect, but when I burn it to either DVD-ROM or author it to DVD and watch it on a TV, those parts of the clip where the source was interlaced (DVD-rip)are very jittery/jerky (almost like stop motion) especially in those scenes where there is a lot of motion. However those parts where the source was avi are perfectly fine, no jitter at all. Does anyone have an idea what could cause this and how I can fix it?

PS: Maybe this helps....the deinterlace method in the Vegas project properties are set to "none" (vs. Blend or interploate) and the render template is based on the "NTSC DVD-Architect", which is 100% DVD compliant. The field oreder is set to "Interlaced, bottom field first", variable bitrate, best video quality, best rendering quality. I didn't change anything in the advanced video tab.

[jagabo]

Change field order to TFF.

[mltwitz]

Wow, that was easy, but I would have never guessed this myself. Thanks, it worked!!