"Add Noise" includes "Add Choppy"

arem wrote on 11/27/2005, 3:52 PM
Just threw together a video promo for my youth group which basically included video clips cutting in and out from static. For some reason, when I add noise and I render the video, the noise is choppy...

Interestingly enough, it works fine on Vegas's preview, but once I render to mpg-2, the video no longer plays smoothly...but only where I use the noise. Is this a bug in vegas? Can anyone else reproduce this? (I do use keyframes to gradually bring in the static, not just cut to it.) Better yet, does anyone have a solution?

Thanks!
-Dan

Comments

Liam_Vegas wrote on 11/27/2005, 4:36 PM
Could be due to the bit-rate... when you add noise the MPEG encoder will basically have a "fit" as it needs to work extra hard at compressing the frames. MPEG encoding is basically done by creating frames based upon the changes from the prior frame(s). So when you add the noise FX the changes from frame-to-frame are very large.

You may get better results by encoding to a higher maximum bit-rate and also doing a 2-pass encode.
arem wrote on 11/28/2005, 1:47 PM
"MPEG encoding is basically done by creating frames based upon the changes from the prior frame(s)"

I forgot about that...makes sense.

Rendering it to AVI made it better (as did the two pass when i tried to go back to mpg)

Thanks!
-Dan