Arbeiten mit ProRes / DNxHD

Metadata is a set of descriptive data that gives information about other data. Timecode, for example, is one common type of metadata. ALEXA delivers a wide range of automatic and human-readable metadata that is intended to make production life easier. Information about the exposure index, gamma and white balance in a shot may be important during camera testing, when dailies are created or in a color grading session. Reel number, project fps, date and time are crucial when bringing together image and sound. Frame by frame information from the Lens Data System and the roll and tilt sensors in the ALEXA Plus can be quite useful for visual effects work.

An ALEXA camera automatically collects metadata when shooting. This metadata is stored in the header of a recorded QuickTime file, MXF file or the header of an ARRIRAW file. The data is also stored in separate Final Cut Pro XML and Avid Log Exchange ALE files, which keep track of all takes that are recorded on an SxS PRO card. ALEXA Plus and ALEXA Studio also record camera lens data as well as roll and tilt information both of which are recorded in the file headers frame-by-frame. Regular and dynamic metadata can be extracted e.g. from the recorded QuickTime files using ARRI Meta Extract, a free ARRI command line tool.
 

Content Description .XML (SxS) .ALE (SxS) META (SxS) ADMD (1)
(SxS)
SDI Grab (3)
Camera Serial Number Serial number of camera as on housing take take take   take take
Camera ID Camera serial number short form take take take   take take
Camera SUP Version Software version active on camera take take take   take take
Sensor Fps Frame rate of sensor take take take   frame frame
Shutter Angle Shutter angle of sensor in degrees take take take   frame frame
Manufacturer Camera Manufacturer   take        
Exposure Index Exposure index value set on camera in ASA take take take   frame (4) frame (4)
White Balance White balance of camera as a color temperature in Kelvin take take take   frame (4) frame (4)
White Balance CC Green/magenta correction value of white balance take take take   frame (4) frame (4)
Gamma Gamma set on image path take take take   frame (4) frame (4)
Look Look file information take take take   frame (4) frame (4)
Image Size Size of recorded image in pixels take take     take take
Camera Model Type of camera take take take   take take
Timecode Timecode information (several different timecodes are supported) take take   frame frame frame
User Bits User bit settings take     frame frame frame
UUID Universal unique identifier created by camera for each new clip take take take   take take
Camera Tilt (2) Vertical deviation of camera in degrees       frame frame frame
Camera Roll (2) Deviation of camera around optical axis in degrees       frame frame frame
UMID Unique media identifier   take        
Lens Type (2) Lens model connected to camera take take take   take take
Zoom Distance (2) Current focal position on zoom lenses take take   frame frame frame
Focus Distance (2) Current focus distance of lens       frame frame frame
Iris Value (2) Current iris value of lens       frame frame frame
Master/Slave Info Identifies master/slave camera take take take   take take
Channel Info Marks left or right channel of 3D setup take take take   take take
Reel Name Name of current reel take take take   frame (4) frame (4)
Take Name Counter of takes on currently active card take take     frame (4) frame (4)
Director name Name of director as entered by user take take take   frame (4) frame (4)
Cinematographer Name Name of cinematographer as entered by user take take take   frame (4) frame (4)
Location Name Name of location as entered by user take take take   frame (4) frame (4)
Production Name Name of production as entered by user take take take   frame (4) frame (4)
User Info 1 Additional info entered by user take take take   frame (4) frame (4)
User Info 2 Additional info entered by user take take take   frame (4) frame (4)
Sound Reel Name Name of sound reel as entered by user take take take   frame (4) frame (4)
SxS Serial Number Number of SxS card used for recording (if used) take take take      
User Date Date as set by user on camera menu take take take   frame (4) frame (4)
User Time Time as set by user on camera menu take take take   take frame (4)
ND Filter Type
(not in SUP 6.0)
Type of ND filter in camera (0= No ND filter, 1=ALEXA Studio ND type 1) take take take   take frame (4)
ND Filter Density
(not in SUP 6.0)
Density of ND filter in camera in 1/1000th density values, only when ND filter is active take take take   take frame (4)

Notes:
(1) The ARRI Digital MetaData (ADMD) atom carries frame by frame metadata and is embedded in the QuickTime and MXF files.
(2) ALEXA Plus or ALEXA Studio
(3) Only for .ari frame grabs.
(4) This metadata is updated every frame but might be delayed in the processing chain by up to 10 frames.