I thought it seemed odd that it is OP1a but in the ARRI DNxHD with ALEXA white paper they address this and it sort of makes sense:
"In a common Avid infrastructure with shared media, Avid products expect files to be re-wrapped using the OP-Atom MXF format, which is optimized for nonlinear editing. Nevertheless, there are a number of reasons that prompted us to choose the OP1a file structure for recording in ALEXA cameras:
• The OP1a MXF format packages picture, sound, and metadata in a single file. This is ideal for both camera acquisition and archiving since audio and video is always kept together and no data is lost if recording is interrupted for any reason.
• OP1a is a streaming format, which means that even incomplete files can be played. This does not only ensure highest data safety but also allows playing clips that are still being transferred (eg. via FTP).
• The OP-Atom MXF format places picture and sound into individual MXF files. Audio is written after video. Using this format for recording in a camera would cause entire takes to be corrupted if the recording is interrupted abnormally, e.g. due to a power loss."
That's only 3 of the 7 bullet points so it's a good read. My biggest worry is that the cost of this upgrade is like $3000 or $5000 or something like that I think. Not much considering the cost of the camera but with rental houses pinching pennies makes me wonder how many will do it.
--- In Avid-L2@yahoogroups.com, Andi Meek <kwikpasta@...> wrote:
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> I asked the Arri rep this at BVE and it's definitely OP1a, although the topic of creating pure Avid OPAtom media came up and all we got was a coy "we're listening to our customers" response, so you never know!
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> Andi
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