AFD - Active Format Description
Active Format Description (AFD) contains aspect ratio and handling information utilized to
aid in picture presentation of downstream devices. This is used most often by
down-converters and set top boxes.
AFD carriage can be carried within a transport stream as a unique ANC PID (ancillary pid),
within the video elementary stream as SEI data (H264), or user data (MPEG2). The RD-71
does not support AFD via an ANC PID at this time.
The RD-71 AFD implementation preserves the native AFD code from the video elementary
stream and is inserted into the SDI ancillary data output on DID/SDID 0x4105. The SDI
output is not modified in anyway based upon this data. SDI line number for AFD carriage is
configurable via the VBI tab. The DID/SDID, AFD code, and aspect ratio flag can be seen in
the VBI Output table via the VBI tab.
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