.ARI File Format

Question

1. What is the structure of .ari (arriraw) file extension?

   I only know the header of this structure which is 41 52 52 49 (ARRI).

2. What are tags of this extension?

Answer 1

What is the structure of .ari (arriraw) file extension?

ARRIRAW is an open format and ARRI have submitted the specification to the Society of Motion Picture & Television Engineers (SMPTE)'s website:

We've successfully submitted two SMPTE Registered Disclosure Documents (RDDs) on ARRIRAW:

RDD 30:2014: ARRIRAW Image File Structure and Interpretation Supporting Deferred Demosaicing to a Logarithmic Encoding RDD 31:2014: Deferred Demosaicing of an ARRIRAW Image File to a Wide-Gamut Logarithmic Encoding.

These documents are available from the Society of Motion Picture & Television Engineers (SMPTE)'s website at https://www.smpte.org.

Source ARRIRAW FAQ

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What are tags of this extension?

I assume that by tags you are referring to metadata.

What metadata is recorded along the image in an ARRIRAW file?

The metadata contains all camera settings, production notes, optionally scene and take information, camera tilt and roll and lens metadata (if an LDS lens/camera was used). Tilt, roll and lens information is recorded for each frame individually, so it is possible to track the exact timing, e.g. when the focus pulls away from one actor to an object in the back.

That data can be accessed and extracted using ARRI Meta Extract (AME) or the ARRIRAW Converter (ARC).

Source ARRIRAW FAQ