Maybe a field order issue? Perhaps source video is actually interlaced but is being marked/detected as progressive (so Vegas doesn't bother with field order adjustments)?

Are you using PAL or NTSC? I think farss (Bob) has mentioned ongoing field order quirks in Vegas when working with PAL video.

Tim L

I'm using PAL interlaced format, the standard video format where I live.
Why should an interlaced video be detected as progressive and how can I fix this?
Thank you

Granted I am on NTSC, but it seems to me I had to reverse the field order when I reversed a clip to get it to look right in the output (my clips were interlaced).

mikey

In newer Vegas versions there should be no need to manually reverse the field order when reversing a video event. I think its fixed since V8.
What deinterlace method did you select in the project properties?

Marco

Hi,
sorry for the delay.
As a matter of fact, I'm not deinterlacing at all.

Selecting a deinterlace method in project properties ("Blend fields" or "Interpolate fields") actually does not deinterlace your video. It is a common advice to leave the project properties' deinterlace method set to "Blend fields" as this is the proper way of preprocessing the video for many tasks.

Lots of problems with interlaced footage begin when people change the project properties' deinterlace method from "Blend fields" to "None" because they think otherwise Vegas would make the output being deinterlaced.
To deinterlace your video (I know - that's NOT what you want to and not what you should do in this case) you would also need to select "progressive" in the render dialog.

So if your project properties' deinterlace method is set to "None" - just give it a try and use "Blend fields" for a test. In the worse case it just does nothing. In the better case it might solve your problem (without deinterlacing your video).

Marco