This IS the Avid L2: [Avid-L2] Re: "What are you grading this week 2013?", survey results.

Saturday, July 27, 2013

[Avid-L2] Re: "What are you grading this week 2013?", survey results.

I have found exporting a QT reference on my Mac SNDX 5.3.3.7 and earlier versions with OS 10.6.8 I can then export to ProRes in QT Pro 7.6.6 with no major gamma shifts and I get the extra audio channels. I can then ama link to the self contained QT ProRes and I only see a slight quadrature like error on the bars vector dots. Doing the same but just saving as and the bars are perfect from the Avid media QT when linked ama. Both have been adequate for network broadcast delivery. Trying to do the same exporting directly from Avid seems to have many more level issues in my limited experience of testing that.

--- In Avid-L2@yahoogroups.com, "Job ter Burg (L2B)" <Job_L2@...> wrote:
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> On 24 jul. 2013, at 08:33, Mark Spano <cutandcover@...> wrote:
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> > Why is this insane? ProRes is perfectly fine to deliver for broadcast.
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> I'm not arguing the quality of the ProRes codec. I AM arguing the Apple H264 codec, which is severely gamma-flawed.
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> I'm also arguing using anythin QT as a broadcast delivery format, since no one seems to know how to check nor specify luma level range for QT delivery. A broadcaster sent me their ident in H264 and in IMX50, both had completely different gamma (the IMX50 being the best looking and probably correct one).
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> And: Apple won't allow you to create ProRes on a PC. So it's severely limited to a platform. That to me makes it far from a desirable common delivery format. But OK, let's assume that we all buy a Mac just to get there. Then there's still the issue with QT. If you export from QT Pro or from the Custom export options in MC (basically using QT), you WILL get gamma shifts when exporting to ProRes. You cannot maintain gamma and luma levels when roundtripping.
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> The same goes for FCP, which in my limited experience only seems to work when you ingest and export through external hardware. File-based import/export in FCP is always messing with gamma and luma levels. I was never able for instance to properly import or export the Belle Nuit Test chart with gamma and luma levels intact. All P2-to-QT reencodes I received from FCP had screwed up gamma when compared to the MXF camera original.
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> The only way I know to properly deliver ProRes is to transcode or mixdown to ProRes in MC6.5 or later, then export Same As Source. Aything QT in the mix will mess with your stuff.
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> I really do feel that Op1A MXF is a much nicer, and more professional way to handle things. And I really, really hate Quicktime. Not the idea of Quicktime, but the common practice of Quicktime. I use it when I have to, often, but reluctantly.
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> J
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