Sunday, April 10, 2011

Re: [Avid-L2] RGB QT export

 

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
>
> [Non-text portions of this message have been removed]
>
>

[Non-text portions of this message have been removed]

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