Supersampling.....

Apollo25 wrote on 7/14/2004, 5:28 PM

I captured a 1hr plus DV clip. added lowerthirds, a track motion segment(5-8secs), Nine(9) short video tracks and two transitions. I rendered this all last night. When I played the clip back there is a noticeable flicker during pans and rapid body movements. I checked "reduce interlace flicker" on each clip's property tab. Was that the right thing to do? And, I am finding that I am having to supersample to reduce the flicker all together. I rendered short segments at 1, 2 ,3 and 4. It appears that 4 does it. My question is 1) what causes this in the first place and 2) Is there another way to "clean this up"? I can already see the need for a second box for renders and to increase productivity....

Comments

Skevos_Mavros wrote on 7/15/2004, 8:09 AM

I can't really help except to ask a few questions.

Is the flicker visible when you play the video on the Vegas Preview Window (on your PC's monitor)? On your video monitor? Both?

Did you render at "Good" quality or better?

Are you doing any frame-rate conversions? NTSC to PAL or speeding up or slowing down video?

Can you put one second of the worst bit online for me to download and look at? Along with one second of the same raw footage too? Otherwise it's hard to advise.

I've never had a flicker problem that needed supersampling of 4 before it went away - usually just rendering at "Good" with Reduce Interlace Flicker is enough. Strange.

Good luck with it,

Skevos Mavros
mavart@mavart.com
http://www.mavart.com

TeetimeNC wrote on 7/15/2004, 9:57 AM

Try adding a small amount of Motion Blur to an offending segment and render that segment to see if that removes the flicker.

Ron Lucas wrote on 7/15/2004, 8:04 PM

I have a similar problem when slowing down clips to 50%. The clips seem to flicker or pulse. It's like the brightness pulsates very slightly. Supersampling for these events seems to make that go away.

I don't select reduce interlace flicker unless I have straight lines in an event, like siding or bricks on a house.

I render at night, so I set supersampling to 8 on the slow mo events, let it render, and good results the next morning. I tried lower supersampling settings like 4, but 8 makes it better.

Ron

Apollo25 wrote on 7/16/2004, 5:11 PM

It is most noticeable when viewed on mm external NTSC monitor. There are no PAL to NTSC conversions. The unaltered raw footage plays back through VEGAS and on the Ext Monitor flawlessly. I did shrink my clip momentarily and then returned it to its original size. I feel like this has something to do with it. Again, what I am seeing is most noticeable during panning.