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Is it really 10-bit? Question for Gary Adcock

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Sean ONeil
Is it really 10-bit? Question for Gary Adcock
on Aug 28, 2008 at 6:22:00 am

... or anyone who knows. Does using Apple Compressor to convert QT Proxies (from Red Alert) into ProRes HQ create a true 10-bit video? Or does it fake it like Quicktime does in other types of conversions?


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Russell Lasson
Re: Is it really 10-bit? Question for Gary Adcock
on Aug 28, 2008 at 5:44:21 pm

QuickTime proxies are 8-bit 4:2:2 in Rec709.

-Russ

Russell Lasson
Ridgeline Digital Cinema Mastering
Universal Post
Salt Lake City, UT


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Sean ONeil
Re: Is it really 10-bit? Question for Gary Adcock
on Aug 28, 2008 at 6:05:57 pm

Really? So using Red Alert to create new QT ref clips and then rendering them in Compressor is not a good workflow then? That sucks.

Sean


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Stuart Ferreyra
Re: Is it really 10-bit? Question for Gary Adcock
on Aug 28, 2008 at 7:49:55 pm

It is a proxie, as a proxie it should have limited data / bandwith to work on various systems including laptops. For true 10bit you have to conform or convert.

It does suck from pne point of view but from another it is the way it should be (for now).

"In Search of a Midnight Kiss" now in theaters!

Stuart Ferreyra
Timecode Multimedia
Colorist / Finisher / Consultant
Off: 310.826.9199
AIM: stuart.colorist
http://www.timecodemultimedia.com

"HD, 2K & RED Post Production for Indies at Affordable Rates"



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gary adcock
Re: Is it really 10-bit? Question for Gary Adcock
on Aug 28, 2008 at 8:38:48 pm

[Sean ONeil] "Does using Apple Compressor to convert QT Proxies (from Red Alert) into ProRes HQ create a true 10-bit video? "

no conversions of proxy files are only 8bit.

"Or does it fake it like Quicktime does in other types of conversions?"
you are catching on....

Now for true 10bit conversions use

REDLINE @ 1/2 debayer to a scaled 2K or 1080 as ProRes/DNXHD/ UC / DPX to keep and maintain the 10bit color space.

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD




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Graeme Nattress
Re: Is it really 10-bit? Question for Gary Adcock
on Sep 2, 2008 at 2:07:35 pm

The Quicktime reference movies point directly to the original 12bit R3D data. If the host app asks for an 8bit decode, it will give it to them. If it asks for the r4fl pixel type (32 float YCbCr) it will give it to it in that format. r4fl is what FCP uses for 10bit codecs.

Graeme

- http://www.nattress.com - Film Effects and Standards Conversion for FCP


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Russell Lasson
Re: Is it really 10-bit? Question for Gary Adcock
on Sep 2, 2008 at 4:48:39 pm

[Graeme Nattress] "If it asks for the r4fl pixel type (32 float YCbCr) it will give it to it in that format. r4fl is what FCP uses for 10bit codecs. "

So if you set the FCP sequence to 10-bit RGB and put a high RED proxy in the timeline and render it, will it be 10-bit 4:4:4?

What if you use ProRes instead? Will the proxy be rendered as 10-bit?

Also, if you use Compressor to transcode proxy files to ProRes, will it maintain 10-bit info?

Thanks,

-Russ

Russell Lasson
Ridgeline Digital Cinema Mastering
Universal Post
Salt Lake City, UT


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Graeme Nattress
Re: Is it really 10-bit? Question for Gary Adcock
on Sep 2, 2008 at 5:06:48 pm

FCP doesn't support 10bit RGB. It does support 10bit YCbCr using r4fl though. Yes, ProRes and Compressor should get you 10bit.

Graeme

- http://www.nattress.com - Film Effects and Standards Conversion for FCP


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Russell Lasson
Re: Is it really 10-bit? Question for Gary Adcock
on Sep 2, 2008 at 5:09:56 pm

Thanks for the reply Graeme.

So if someone asks if they use the proxy files, it will depend on how they use it if it is 10-bit or 8-bit.

Thanks!

-Russ

Russell Lasson
Ridgeline Digital Cinema Mastering
Universal Post
Salt Lake City, UT


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Graeme Nattress
Re: Is it really 10-bit? Question for Gary Adcock
on Sep 2, 2008 at 5:11:07 pm

Basically yes, it's up to the application to ask for the right kind of data.

Graeme

- http://www.nattress.com - Film Effects and Standards Conversion for FCP


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gary adcock
Re: Is it really 10-bit? Question for Gary Adcock
on Sep 3, 2008 at 12:14:34 pm

[Graeme Nattress] "Basically yes, it's up to the application to ask for the right kind of data. "

or hardware to force it to look to the right place.


thanks for the input Graeme.....

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD




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