Alexa also has an option to record the actual raw uncompressed data
straight to a hard drive as 2880x1620 .ari files, which is the true
native format of the camera. It's not so popular because you have to
lug around (and pay for) an extra storage unit, but any projects with
significant VFX will insist on it. The Prores encoding is done on-board
and saved in realtime to lightweight flash cards, but even with 4:4:4:4,
there are definitely compression artifacts in the quicktimes that aren't
there in the raw files, not to mention the down-res to 1920.
-A
On 9/22/2011 9:39 PM, Nick Guth wrote:
Confirmed. It is Apple ProRes4444
1920x1080
23.98
278.55 mbits/s
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