The LDT-R2 injects frame by frame lens metadata into the Sony Venice RAW files. This guide gives a breakdown on how the metadata can be extracted, where the LDT's phase its data, how they are stored and where they can be found.
The metadata are collected as dynamic metadata, meaning each individual frame of any clip will have accurate FIZ data associated with it. Depending on which format is being used, the output file consists of a table of cells arranged into rows and columns and referred to by the X and Y locations. X locations are the metadata headers, Y is the data collected. The longer the length of the clip the bigger the size of the table.
Timecode is embedded in the .csv and is used to sync the footage.
Sony Raw Viewer is required in order to extract frame by frame data from Sony Venice footage. It can be downloaded from Sony website:
On Raw Viewer go to the Export Tab, from format choose: CSV (Cooke Lens Meta). Save the setting as template.
Load the clip that need to be exported in the Task Queue and run the process.
The CSV file is a tab delimited type of file. The name of the CSV file is the name of the clip. This list consists only of the column headers that are relevant to the LDT-R2 or where the LDT-R2’s data can be found:
Below we also identify which data is expected to be dynamic (D) and which is expected to be static (S)
|Header name||Metadata type||Description|
||(D)||An incremental number, one increment per frame starting from
||(D)||The timecode of the camera at that moment in time|
||(D)||Distance expressed in millimeters (mm). Infinity mark is expressed with the value
||(S)||It uses one decimal place to express aperture.|
||(D/S)||Focal length expressed in millimiters. Static value if prime lens have been used, dynamic value if zoom.|
||(S)||The serial number of the lens. This value is user defined at the time of encoding.|
Data size will vary depending on how many columns Sony RAW Viewer is set to extract, below there is an example of data size for reference. A CSV files extracted from a Sony RAW file contans 367 bytes of headers and ~82 bytes/frame of data, for ~2335 kbps @24fps.
Here is a sample file showing three frames:
Index Timecode Calibration Focus Distance(mm) Aperture Value Aperture Ring T Stop Integer Aperture Ring T Stop Fraction(+ n/10) Current Focal Length(mm) Hyperfocal Distance(mm) Near Focus Distance(mm) Far Focus Distance(mm) Horizontal Field of View(deg) Entrance Pupil Position(mm) Normalised Zoom Value Lens Serial Number Cooke Protocol User Metadata Lens Attributes 1 06:56:38:09 0 498.0 2.06 2.0 1 0 51103.0 494.0 502.0 27.1 56.0 0.000 50-1089M 2 06:56:38:10 0 498.0 2.06 2.0 1 0 51103.0 494.0 502.0 27.1 56.0 0.000 50-1089M 3 06:56:38:11 0 498.0 2.06 2.0 1 0 51103.0 494.0 502.0 27.1 56.0 0.000 50-1089M