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If you want highter bit depth J2K, you have to render to image sequences. The baseline QT implementation is from the stone age. Perhaps there's some commercial third-party Codec out there or if you have such hardware, you could use Blackmagic's, but off the bat there is nothing usable in QT as far as I know.
I was beginning to suspect as much...thanks for confirming for me.
I guess that leads me to another question, then: what's the point of having the "render at maximum depth" option in Premiere for throwing stuff into Media Encoder?
AME has all kinds of options including 32bit image sequences.
Thanks for the heads up, Rick. Media Encoder definitely was the key. Cheers!