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Very different file sizes from resolve

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Tom Sefton
Very different file sizes from resolve
on Mar 10, 2020 at 2:27:05 pm

Hi

2 camera shoot, both Red Heliums. Shooting at 8K 60p. Both used same Red Compression.

Add noise reduction, sharpening and basic levels to both clips. Hit export. Rec709 colourspace and both cameras using same Red profile.

Send timeline to Deliver, encode to ProRes422HQ

One file is delivered in the hundreds of gigabytes. The other in the tens. There is no noticeable difference in quality, or colourspace, just the data rate and size.

Is there a reason for this??

Co-owner at Pollen Studio
http://www.pollenstudio.co.uk


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Tero Ahlfors
Re: Very different file sizes from resolve
on Mar 10, 2020 at 6:55:19 pm

Not enough information to really say anything.


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David Roth Weiss
Re: Very different file sizes from resolve
on Mar 10, 2020 at 7:03:40 pm

Unless both cameras were setup identically in every respect, including deep settings such as sharpness, you won’t have a baseline that would indicate the difference in the two cameras. In any case, tiny differences sharpness and noise can greatly influence file size. And, I’m not talking about aberrations visible to your eyeballs - you might think the cameras are setup identically, but you’d have to check every setting in the menu to be certain.

David Roth Weiss
Director/Editor/Colorist & Workflow Consultant
David Weiss Productions
Los Angeles


David is a Creative COW contributing editor and a forum host of the Apple Final Cut Pro Legacy forum.


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Michael Gissing
Re: Very different file sizes from resolve
on Mar 11, 2020 at 3:46:10 am

Such a big difference would make me check both are rendered to the same pixel aspect and codec. ProResHQ does vary slightly but not to that extent. I can't believe they are identical pixel aspects and codecs.


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Oliver Peters
Re: Very different file sizes from resolve
on Mar 11, 2020 at 12:12:09 pm

What was the original size difference between the two sets of native RED files?

- Oliver

Oliver Peters - oliverpeters.com


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Tom Sefton
Re: Very different file sizes from resolve
on Mar 12, 2020 at 10:43:15 am

Both Red cameras were setup absolutely identically. The were running as master and slave.

The r3d files were within a few 100MB of each other.

The only thing I can think is that one camera had more noise due to a difference in flagging, which means that the output file has more noise, at a level I cannot see on any of the monitors I'm using to view. Even the waveform of the ProRes file is identical.

Co-owner at Pollen Studio
http://www.pollenstudio.co.uk


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Oliver Peters
Re: Very different file sizes from resolve
on Mar 12, 2020 at 12:16:21 pm

To cross-reference, you might want to try a transcode in Redcine-X Pro or some other app, just to see if you get the same results. I would suspect noise, as well.

- Oliver

Oliver Peters - oliverpeters.com


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