I've been trying to solve this for about 10 days now and I do not know what's causing it.
My video appears to be bouncing up and down and I've tried changing various settings/resolutions but it's still doing it.
Here is an example of what I mean: Sony Vegas Boucing Video Problem - YouTube
I have tried various different resolutions. I've changed the field order to upper, lower and none (scan progressive). I've changed deinterlace methods. I've changed Motion Blur Type; and I've changed Frame Rates.
It appears to do it on everything. The original video isn't bouncing at all, however I need to deinterlace it and brighten it, hence needing to use Sony Vegas.
My Sony Vegas version is 11.
I hope somebody could help me!