Footage looks slightly degraded

G

Genesis

Active member
Hi I have a big problem and can’t figure it out nor find anything on the internet that helps.

The problem is that if I change the position of my clip on the timeline using the motion effect, but the quality of the clip looks slightly worse after doing so, even after rendering.

I’m changing the position of my clip because I’m letterboxing 4:3 footage and better fitting it within the black bars.

Is their any way to do this without any quality loss in premiere pro 2.0.

Thanks allot.
 
Not sure what you are saying: You apply the motion effect and are unhappy with the result? Why would you assume it can be done 'without any quality loss'? You are moving pixels around and forcing a rendering -- there will always be a 'hit' if you do that.

Am I missing the point?

GB
 
He's not increasing the scale or stretching the image. He's just shifting the image up and down, there should be no quality loss. I can't explain it either.
 
Moving the image within the frame (vertical center shift) shouldn't effect image quality, however, if you are trying to put a .9 PAR acquired shot in a 1.2 PAR project by performing an unconstrained stretch, you will slightly degrade the image.

If this isn't what is happening, then post a frame grab both before and after to illustrate the problem.
 
Genesis,

Yes, even a simple move will trigger a re-render of your footage. In fact, putting the mask over the footage will force a re-render of all the footage, even if it's not moved, because of the addition of the mask.

If this is the final step before going out to DVD, and you export straight out of Premiere to DVD, it shouldn't effect you. You will only see degredation when exporting to a compressed format, including back out to DV-AVI. The only way to retain full quality is to go out to an uncompressed format (lots of storage space required).

Josh
 
I’m definitely just adjusting the footage vertically and dead center, but after rendering there is a tiny loss of quality right on the timeline, even when I export uncompressed avi it’s still their. I posted a before and after example but you may not see it on account of compressing it for the web and the loss is minimal but still their.

Here’s the before
frame-good-web.jpg



And here’s the after (moved slightly up a few percent)
frame-bad-web.jpg


I understand that Premiere has to re-render the pixels but just seems funny if there is no actual way to do this without any quality loss. Does FCP or AVID have the same issue, is their nothing that could be done. Again the loss is minimal but the fact It’s there is a major pain, any other ideas?

Thanks again.
 
maybe i am imagining it, but in pp1.5 i find that the image deteriorates if the motion effect position is an odd number eg 360 301, but the quality stays the same if i have the position as an even number, say 360 300.
 
ade4all, you are absolutely right, I just tried that a few hours ago and what do you know, it works, when your on an even number then the footage stays the same quality.

Thanks allot for your and everyone else’s feedback.
 
glad to be of help & also to know that i'm not going mad - quite why you need to place the image on even numbers, & why adobe do not make people aware of this is a mystery to me
 
Non integer resampling always results in a quality hit. This isn't unique to Premiere nor even NLEs in general.
 
Genesis -

Try to do that in After Effects. Though it's not a big deal imo, just normal side effect of resampling, you may get better results in AE because sampling algorithm is more sophisticated there and operates on 256 subpixel levels.
 
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