Additional recommendations
To minimize the risk of lost data, ARRI suggests the following
guidelines for data management:
Pre-format your media. Format all the drives/cards in the camera
before shooting begins. This will save production time at least
until all cards have been used once. The media do not receive a
reel number until the first clip is recorded, so there is no need to
use the cards in the same order they were pre-formatted.
Formatting a 32 GB card normally takes less than 10 seconds.
Limit the recording time, especially on the drives. Compressed
recording offers very long recording times. Please consider
limiting the recording time to 30 minutes of footage per
card/drive to reduce risk of loosing data.
Download and back up data immediately after reloading the
camera to minimize the time that data exists in just one place.
On SxS cards, use the write protect tab before sending it to the
data wrangler.
After an SxS card has been downloaded and backed up,
disengage its write protect before formatting.
Metadata
Metadata is stored in the XML file, the ALE file and in the recorded
frames/clips. The most important metadata for post production
workflow is the tape name, as it will be one of the primary identifiers
used in the EDL. The term tape name is an existing post-production
naming convention that is also used for nonlinear media. The terms
tape name and reel name may be used interchangeably.
The tape name of ALEXA files is limited to 8 letters to match the CMX
3600 EDL standard. It consists of the Camera Index, reel counter and the
Camera ID. Based on the previous example, the tape name of the clip
would be A004R1JL.
Even if the user forgets to assign different camera indices to two
cameras on the same project, the Camera ID metadata guarantees
unique tape names.
The Quicktime file carries a single timecode track.
In DNxHD/MXF files, metadata is stored as an .ale file, and in an XML
file embedded in the MXF.
For more information, please refer to the Metadata white paper
available for download on the ARRI website.
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