3 sd aspect ratio convert – AJA FS1 User Manual
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FS1 Installation and Operation Manual — 5.3 SD Aspect Ratio Convert
Note:
Active Format Description (AFD) codes are carried in the vertical ancillary
(VANC) portion of HD SDI video signals, specified in SMPTE 2016 as follows:
“AFD information is intended to guide DTV receivers and/or intermediate
professional video equipment regarding the display of video of one aspect ratio on a
display of another aspect ratio.”
In the FS1 downconverter, the AFD code on the video input can be used to guide
the downconverter in choosing which mode to use to best display the important
content of the input 16:9 HD video on the 4:3 SD output. For example, if the
input AFD code is 10 (“Full Frame”), it means that the input video has important
picture information throughout the full 16:9 frame, so the downconverter should
use Letterbox mode to be sure none of the content is cropped off. An AFD code of
9 (“Pillarbox”) says that the input video only has content within the center 4:3
area of the picture (usually because it originally came from an upconverted SD
signal) so the downconverter “Crop” mode would be the best choice. There are 16
possible HD AFD codes, of which 8 are in common use. The FS1 does not
process or use SD AFD codes.
FS1 AFD processing (passing, removing, and re-inserting) occurs based on the
setting of parameters 5.2, 5.5, 5.6 and 5.7.
5.3 SD Aspect Ratio Convert
This parameter selects an SD to SD Aspect Conversion mode for converting between
normal 4:3 SD video and either 16:9 Anamorphic SD video or Letterbox SD video.
(In Europe 16:9 anamorphic video is also known as “Wide screen” video.)
5.3 SD Aspect Ratio Convert
Description of Choices
Parameter Adjustments:
Off
(Default)
Letterbox
H Crop
Pillarbox
V Crop
14:9
Turns aspect ratio conversion OFF
Converts 16:9 Anamorphic video to Letterbox video
Converts 16:9 Anamorphic video to 4:3 Standard video
(crops left and right edges of video)
Converts 4:3 Standard video to 16:9 Anamorphic video
Converts Letterbox video to 16:9 Anamorphic video
Converts 16:9 Anamorphic video to 14:9 Cropped video