[Avid-L2] Re: Dnx220 vs. 220X file size?

 

This is a source of constant frustration.
We often have clients startingwith 8 bit content ultimately delivering on 8 bit tape or 8 bit Blu-ray who want to work at 185X because 10 bit must be better.
And trying to explain that they are gaining nothing and compressing more is very tedious.

--- In Avid-L2@yahoogroups.com, "johnrobmoore" <bigfish@...> wrote:
>
> I had guessed that there was more compression happening but I wasn't sure. Thanks for hitting me over the head with the data rate, duh. I won't have to think twice in the future. Sometimes I find I don't understand everything I thought I knew so well. ;-)
>
> --- In Avid-L2@yahoogroups.com, Dennis Degan <DennyD1@> wrote:
> >
> >
> > On Aug 8, 2011, at 2:58 PM, John Moore wrote:
> >
> > > A friend said he imported a CG QT file as 220 and 220X and the
> > files are the same size. He is speculating that the 10 bit codec must
> > have to have lower resolution in order for the file sizes to be the
> > same. I'm not sure what exactly he means by the same size, I can't
> > imagine they would be exactly the same size. I'm trying to get more
> > specifics. Would it make any sense that the 10 bit codec might allow
> > for more efficient compression than 8 bit? I would really doubt there
> > would be a loss of resolution to accomodate more color depth.
> > Ultimately the concern is image quality when resizing shots. 220X
> > should be better than 220 for everything right? If not I'm feeling
> > everything I know is wrong.
> >
> > I rhetorically ask:
> >
> > "What part of '220Mbps' do you not understand?" (I know, I'm being
> > snide . . . . sorry.)
> > But seriously, DNxHD 220 and DNxHD 220X both operate at 220Mbps,
> > hence the number in the name '220'. 220X simply has slightly more
> > compression in order to provide the higher bit depth. The resolution
> > is the identical between the two.
> >
> > Dennis Degan, Video Editor-Consultant-Knowledge Bank
> > NBC Today Show, New York
> >
>

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