banding on DVD playback

Zealey wrote on 3/1/2008, 4:30 AM
Hi There

I've been searching this forum (and other places on the net) for definite answers and there doesn't seem to be any, however any advice is welcome......

I make animations for music videos. I use a 3D app called Carrera and render all my animation sequnces to uncompressed AVI /1024X576/72 dpi and then do my final edit in Vegas Movie Studio 8.

I render the output to 'PAL DV Widescreen' and then use DVDA to burn my DVD's. My problems are these:

Playback on the PC is much smoother on the PC. If I re-render my DV file to something like WMV playback is super smooth.

DVD playback however results in banding on the images and has a kinda jerky-ness that is not there. there is almost a harsh edge with a kinda flickering of light going on. Even moving text. created within VMS seems to have this kinda jerkyness to it.

I'm also struggling with rolling credits. On the PC they are super smooth, on the DVD they appear jerkey and kinda flickering in brightness. The scrolling kinda jumps. I am basically panning over one jpg (that contains white text and black and white logos) to get the srolling effect.

I tried an experiment yestrday where I exported to an uncompressed AVI with the same dimensions as my orginal clips, the banding seemed to go but the playback was still jerky.

My projects are very small, usually about 4 mins max so I PAL DV file is usually around the 700/800 meg mode. If I use the uncompressed method above, they are more like 18gig.


I guess what I want to know is (and i know similar question have been asked here many times:

a) What is the best way to use Vegas to get the best quality? Do the project setting have any influence over the final render?
b) Should I be exporting to PAL DV or is there a better way to export to AVI for making DVD's with DVDA?
c) What is the best way to create credits that scroll smoothly for DVD?
d) Is there anything i can do to my animated sequences before the final render that would improve the final DVD quality?

I've tried exporting to mpeg2 (to elminate the need for recompressing) but Vegas keeps crashing.

Cheers in advance
John

Windows XP
P4 /3.4GHz
2GB RAM

Comments

Ivan Lietaert wrote on 3/1/2008, 9:01 AM
My guess is you have a problem with interlace flicker.
Right-click on the events on the timeline, and select 'reduce interlace flicker'. There is also a 'switch' to do this for all the events in your project, which is huge timesaver if you have lots of them.
Also apply this to the credits (I think it is actually a default setting for Vegas credits, but you should check anyhow.)

edit: to avoid crashing, make sure the image size of your imported stills an generated files is LESS than 2048 x 2048 pixels.
Alan T wrote on 3/1/2008, 10:33 AM
I'm new at video editing but old timer on photoshop and Illustrator.
I had problems with crashing on my first videos - I had about 180 Photos in Tiff format. It was suggested that I change them to png. which I did. I also made my frame size either 655x480 pixals, 1310x960 or 1965x1440. I currently use 1310x960. I found 655x480 was not sharp enough after rendering.

png is similar to jpeg, now I would probably use jpeg.

Since doing this I have had no problem with crashes.
Good luck.