I just figured this out:
If you are using interlaced footage and you go from 4:3 to 16:9 interlaced using Ultimate S, Celluloid or doing the settings manually in Vegas, you need to have the deinterlace method in the project properties set to either "blend fields" or "interpolate". Otherwise the interlace pattern will be resized and you will get horrible looking squiggley vertical lines any time there is motion.
I've made several posts in frustration the last couple of months about how when I go from 4:3 to 16:9 in Vegas I get wavy vertical lines from the interlace pattern being resized. What was so frustrating is that when I first got Ultimate-S it worked perfectly. Then it stopped working and I could no longer change aspect ratios without wormy looking squigley vertical lines every time there was any movement. For a while I was convinced that it was a Vegas 5.0d bug because when I downgraded to an earlier version of Vegas it worked properly again. Then I tried changing aspect ratios again and had the same problem even with the earlier version.
Anyway, I finally figured out what was wrong. In the project properties I had changed the deinterlace method from "blend fields" to "none". It turns out that even though the footage is interlaced both before and after the aspect ratio conversion, deinterlacing is part of the resizing process. I experimented and find that both "blend fields" and "interpolate" work equally well. I did test renders both ways and cannot see any difference. If you set the deinterlace method to "none" though, boy does it look awful.
There were some posts about wormy looking vertical lines on HD to SD resizes and I'll bet it is the same problem. Evidently the deinterlace method is important for more than just deinterlacing! Anyway, my problem is solved and I'm back on the latest version of Vegas and all is well.
If you are using interlaced footage and you go from 4:3 to 16:9 interlaced using Ultimate S, Celluloid or doing the settings manually in Vegas, you need to have the deinterlace method in the project properties set to either "blend fields" or "interpolate". Otherwise the interlace pattern will be resized and you will get horrible looking squiggley vertical lines any time there is motion.
I've made several posts in frustration the last couple of months about how when I go from 4:3 to 16:9 in Vegas I get wavy vertical lines from the interlace pattern being resized. What was so frustrating is that when I first got Ultimate-S it worked perfectly. Then it stopped working and I could no longer change aspect ratios without wormy looking squigley vertical lines every time there was any movement. For a while I was convinced that it was a Vegas 5.0d bug because when I downgraded to an earlier version of Vegas it worked properly again. Then I tried changing aspect ratios again and had the same problem even with the earlier version.
Anyway, I finally figured out what was wrong. In the project properties I had changed the deinterlace method from "blend fields" to "none". It turns out that even though the footage is interlaced both before and after the aspect ratio conversion, deinterlacing is part of the resizing process. I experimented and find that both "blend fields" and "interpolate" work equally well. I did test renders both ways and cannot see any difference. If you set the deinterlace method to "none" though, boy does it look awful.
There were some posts about wormy looking vertical lines on HD to SD resizes and I'll bet it is the same problem. Evidently the deinterlace method is important for more than just deinterlacing! Anyway, my problem is solved and I'm back on the latest version of Vegas and all is well.