About Active Format Description
The AFD is defined during production. By inserting metadata about the aspect ratio into the vertical ancillary data, AFD can define the aspect ratio of the signal as it progresses through ingest, editing, up/down conversion and playout. If the aspect ratio is altered during processing, then the AFD passed on downstream might need to be modified to ensure the correct aspect ratio is obtained.
Note: If ARC leads to unsupported active video format (postage stamp),
the new AFD code will be the ‘undefined’ value of 0000.
The playback Aspect Ratio Conversion (ARC) is prioritized according to
the following table:
Note: Bar data is not supported on the K2 system.