What is the proper method to test whether a file is 8 o10 bit? From this thread just because the inspector window say trillions how do you know the bits aten't getting truncated? Is there a specific test pattern to use etc...?
--- In Avid-L2@yahoogroups.com, Michael Brockington <brocking@...> wrote:
>
> It's also worth mentioning that the same problem exists going in the
> other direction.
>
> If you export a 10-bit uncompressed material from the Avid using
> same-as-source, you get a 10-bit quicktime. Testing will confirm it
> really is 10-bit. But if you bring this into After Effects it shows up
> as a footage item with only "Millions of Colours" and pixel values are
> truncated to 8 bits.
>
> Cheers,
> --Michael
>
> On 11-04-10 2:54 PM, Chris wrote:
> >
> > So Michael, if I read this right you are saying there is no way to any
> > sort of QuickTime out of after effects for Avid import and stay 10 bit.
> >
> > Correct?
> >
> > Wow! Is this an Adobe or Avid problem (codec)?
> >
> > Chris Magid
> > RTVF
> > Office- 214 350 7212
> > Cell---- 214 766 7212
> >
> > On Apr 10, 2011, at 1:56 PM, Michael Brockington <brocking@...
> > <mailto:brocking%40sfu.ca>> wrote:
> >
> > > Hi Nigel:
> > >
> > > When I was looking into this a few months ago, Avid confirmed that
> > > all third-party 10-bit codecs were truncated to 8 bit on both import
> > and
> > > export. With quicktime, the only way to preserve 10 bits in and out was
> > > through fast-import of Avid-codec quicktimes and Same-as-source
> > > exports. The other option was to use 16-bit TIFF file sequences, which
> > > was what worked best for my circumstances. I am currently working on
> > > 5.0.3.x, and that release stills seems to truncate in the same way.
> > >
> > > In terms of confirming whether your export is 10-bit or not, you
> > > could bring your clips into After Effects and check what it reports
> > when
> > > you select the item in the footage window. It will identify 10-bit
> > > footage as having Trillions of Colours (vs Millions for 8-bit.)
> > > However, this won't show you if your footage has been truncated to 8
> > > bits within the 10-bit range. You would need to do some testing with
> > > test patterns to confirm that. The other problem with After Effects, is
> > > it doesn't seem to recognize Avid's 10-bit codecs (AvidPacked and
> > > RGBPacked) as having 10 bits, only 8. One reason why TIFF sequences
> > > work better for me for 10-bit file exchange.
> > >
> > > Cheers,
> > > --Michael
> > >
> > > On 11-04-10 7:37 AM, Nigel Gourley wrote:
> > > >
> > > > So we AMA to 4:4:4 prores QT and then want to export as RGB
> > > > uncompressed QT.
> > > > This all works except I wanted to confirm it was actually a 10 bit
> > > > file and
> > > > not 8 bit. How do we do this.. We have used mediainfo usually for
> > > > finding a
> > > > file spec but while it gives bits for some formats it doesn't for
> > others
> > > > including prores..
> > > >
> > > > How can we confirm it's a 10 bit file if indeed it is?
> > > >
> > > > Thanks
> > > >
> > > > N
> > > >
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> > > >
> > > >
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