Product specifications

Up/Down/Cross (UDX) Conversion
189
Active Format Description (AFD)
Active Format Description (AFD) is a type of ancillary data that can be attached to each frame of
video, both into and out of AirSpeed 5000. The AFD data consists of two parts:
• A 4-bit code that identifies the active video
• An aspect ratio that defines the overall shape of the image
If Switch on Fly is selected in the Output Format Behavior field on the Playback page, AirSpeed
5000 will output AFD ancillary data for each video frame played. For information on the AFD
codes used by AirSpeed 5000 for input and output AFD, including examples of their
corresponding video formats when performing an Up, Down and Cross conversion with
AirSpeed 5000, see “Up, Down, Cross Convert (UDX) Examples” on page 184
AutoAFD
There are two different behaviors for the AutoAFD options:
If one of the AutoAFD options is selected as the Up, Down, or SD Cross convert option, then
AirSpeed 5000 will use an intelligent algorithm to reshape or convert the video image. The
conversion from input format to output format is detailed in “Up, Down, Cross Convert (UDX)
Examples” on page 184.
If the video being played does not contain AFD information, then AirSpeed 5000 uses the
“default” specified in the configuration settings. For example, if AFD exists in the incoming
video, the setting “AutoAFD Default Pillarbox” follows the approach outlined in “Up, Down,
Cross Convert (UDX) Examples” on page 184, and will use Pillarbox, if AFD does not exist in
the video.
ATC and VITC Timecode
For HD streams, we use Ancillary TimeCode (ATC). ATC is always stored and displayed in
25/30 Hz timing, even for progressive video formats. AirSpeed 5000 implements SMPTE RP188
Ancillary TimeCode.
For SD streams, the timecode is Vertical Interval TimeCode (VITC).
Generally, when a clip is recorded, you can select from a variety of timecode choices. The
selected option is used to set the clip’s base timecode.
At playback time, you can select whether to use the clip’s base timecode, or the frame embedded
timecode, for output to ATC or VITC.