multiple rendering ruin quality? at DVinfo.net

Go Back   DV Info Net > Cross-Platform Post Production Solutions > Adobe Creative Suite

Adobe Creative Suite
All about the world of Adobe Premiere and its associated plug-ins.


Reply
 
Thread Tools Search this Thread
Old January 27th, 2006, 11:54 AM   #1
Major Player
 
Join Date: Feb 2005
Location: Los Angeles, CA
Posts: 429
multiple rendering ruin quality?

I don't know if this is a myth, but I've heard it several times. Does multiple rendering sessions of the same video project file (with color corrections, etc) kill the quality of the raw video after each rendering run? Or is this just a myth?
Spike Spiegel is offline   Reply With Quote
Old January 27th, 2006, 12:56 PM   #2
Regular Crew
 
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 40
Multiple renders

The only time that multiple renderings will not cause quality issues is if you are working with uncompressed video. In other words video that is not compressed in any way, full resolution, 4:4:4 YCrCb. Which alas DV is not.
Now having said that a couple of passes is not going to cause any major quality issues, but choose the order for operations carefully. Perform compositing first, as any problems will show in edges, especially with green or blue. And colour correction last. Everything else can go in the middle. Also remember this would only be true where everything is not being done in the same timeline and not rendered out between passes.
Just remember that uncompressed DV is an oxymoron, all DV is compressed as is most video that we work with (that includes DigiBeta, YCrCb 4:1:1 with 1:3 DCT)
Keep rendering passes to a minimum and you will be OK.
__________________
Devlyn Hukowich

TwoBit Digital Inc.
Video and Computer Geek
P4 3.06GHz, 2GB RAM, Matrox RT.x100, dual head display
Devlyn Hukowich is offline   Reply With Quote
Old January 27th, 2006, 07:22 PM   #3
Trustee
 
Join Date: Jun 2002
Location: Clermont, FL
Posts: 1,520
Using the wrong terms

Sorry folks, but this is a case of using the wrong words, or attaching the wrong meaning to the word "render".

In Premiere and Premiere Pro, the word render means to create preview files. To create a new AVI file requires an "export".

So, you can render all you want without losing quality. If, however, you export to a new AVI, then add effects to that, export again, then add more effects, you will soon be disappointed in the quality.

If, however, you render, add effects, render again, nest a sequence in a sequence, render again - then there is no quality loss added each time. You still lose one generation when you export, but not until you export.
__________________
Steven Gotz
http://www.stevengotz.com
Steven Gotz is offline   Reply With Quote
Old January 27th, 2006, 10:19 PM   #4
Major Player
 
Join Date: Feb 2005
Location: Los Angeles, CA
Posts: 429
Hi Steven, yeah I meant export. I'm not talking about reexporting exported files with effects. I have 17 min worth of footage in my work area, I modded them graphically only with the color correction filter. My question is, will the raw footage be harmed if I keep rexporting multiple times, from the raw footage..?
Spike Spiegel is offline   Reply With Quote
Old January 27th, 2006, 11:05 PM   #5
Trustee
 
Join Date: Jun 2002
Location: Clermont, FL
Posts: 1,520
The raw footage is never, I repeat, never touched. Ever. The Premiere Pro project files are merely references to the original. You can export 1000 times in 1000 different ways and never make a change to the original.

Only if you export, then use that file in a project and make more changes, then export... etc - then you will have problems.
__________________
Steven Gotz
http://www.stevengotz.com
Steven Gotz is offline   Reply With Quote
Old January 28th, 2006, 02:52 AM   #6
Major Player
 
Join Date: Feb 2005
Location: Los Angeles, CA
Posts: 429
gotcha, glad to hear that, thanks for clearing that up!
Spike Spiegel is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Cross-Platform Post Production Solutions > Adobe Creative Suite

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:48 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network