I recorded freeway traffic for 60 minutes on dv. Then transfered it . When I use the velocity envelope and play at best or good quality it gets blurry. However if I watch at preview quality the video looks smoothe. How do I face this problem?
How does it look when you actually render it, transfer it to tape, and then play it from tape to your monitor? You will almost certainly have to render the video and play it to a monitor to tell how it looks.
If it doesn't look the way you want it to, you could try disabling resampling for the event (right-click, properties). You could also try force resampling.
Are you reversing the motion? There is a known bug in most versions of Vegas that reverses the field order when the motion is reversed and this will make the video look blurry.
Reversing motion? Is that playing the video backwards?
Yes.
Also when you render timelapses do you use avi lower field first or progressive?
You don't do anything different from a normal render. Just leave the upper/lower set to match what you put on the timeline.
WOW I used progressive scan with disable resample and now looks great!
That's good to hear, and if you are satisfied, that's the end of it. However, be aware that if it now looks good on your computer monitor, it may look totally different on your television monitor. In general, if you plan to watch on your interlaced television monitor, then you should not render progressive.
When doing timelapse in Vegas i always disable resampling. With resampling on you can end up with hundreds or thousands of frames being blended together and the results are nearly guaranteed to be mush. I also leave the interlace/progressive setting identical to the source material and let the playback device deal with it. Hardware seems to do much better than software for deinterlacing.