rendering .WMV files at DVinfo.net

Jeff Harper · September 22nd, 2007, 09:23 AM

Two projects, same length, one .wmv file is 20MB, the other is 14MB...I'm using the same settings...anyone have a clue? Can content of a clip affect size?

Darrin Ward · September 22nd, 2007, 09:39 AM

Quote:

Originally Posted by Jeff Harper

Two projects, same length, one .wmv file is 20MB, the other is 14MB...I'm using the same settings...anyone have a clue? Can content of a clip affect size?

If you are using variable bit rate, the more motion you have, the higher the file size will be.............I think :)

Mark Stavar · September 23rd, 2007, 08:55 PM

My understanding is that content can effect output size as the compression typically uses a form of delta'ing, comparing one frame with the next: the more that changes, the more that needs to be written out.

Ciao,

marks

Jeff Harper · September 23rd, 2007, 10:08 PM

Thanks guys, I have found amazingly little on this in a couple of quick attempts at googling for info.

I was rendering at quality VBR rate, then tried the others and found that Bit Rate VBR (peak) is comparable in quality, and a bit smaller in file size.

A 2min file I rendered today was 75% larger than another with the same settings though...amazing.

September 22nd, 2007, 09:23 AM	#1
Jeff Harper Inner Circle Join Date: Jun 2005 Location: Cincinnati, OH Posts: 7,400	rendering .WMV files Two projects, same length, one .wmv file is 20MB, the other is 14MB...I'm using the same settings...anyone have a clue? Can content of a clip affect size?

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September 23rd, 2007, 08:55 PM	#3
Mark Stavar Regular Crew Join Date: Aug 2007 Location: Brisbane, Australia Posts: 95	My understanding is that content can effect output size as the compression typically uses a form of delta'ing, comparing one frame with the next: the more that changes, the more that needs to be written out. Ciao, marks

September 23rd, 2007, 10:08 PM	#4
Jeff Harper Inner Circle Join Date: Jun 2005 Location: Cincinnati, OH Posts: 7,400	Thanks guys, I have found amazingly little on this in a couple of quick attempts at googling for info. I was rendering at quality VBR rate, then tried the others and found that Bit Rate VBR (peak) is comparable in quality, and a bit smaller in file size. A 2min file I rendered today was 75% larger than another with the same settings though...amazing.