AJA IoExpress - Manual (Page 36)

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Format Screen Settings
Video Format—This pull-down menu shows the currently selected format. This pull-down
appears in both the Primary Format area of the Formats screen and the Secondary Format
area (if present). If you select an alternate value in the Primary Format using the pull-down, it
will change the format used by Io Express’s framebuffer. Video Format can only be changed
when the Control Screen menu has the setting “Input Pass through”. When a change is made
via the Video Format pull-down, the block diagram will change to reflect the new format.
In the case of Secondary Format, the formats available can vary based on what the Primary
Format is and the input signal (frame rates of input sources limits the to/from conversion
choices). The “Secondary Video Format” pull-down menu lists all formats with those that are
incompatible shown in gray (these can’t be selected). This allows you to see what you've
chosen, and also see those formats that are incompatible with the selected Primary format.
For more details on Io Express Primary and Secondary Formats see “About Primary &
Secondary Video Formats” on page 3.
Note: The IO Express Control Panel software uses the abbreviation “sf” instead of “psf” when
referring to “progressive segmented frame”. In the manual and in other literature you may
see either of these acronyms used interchangeably.
VANC—Below the Primary Format pulldown menu, you can check the VANC box to include
Vertical Ancillary Data in the video stream. VANC enables Closed Caption Ancillary data to be
played or captured. If you have a file with a Closed Caption track, this checkbox must be
enabled for the data to be inserted in the SDI output stream.
Down-conversion: For down-conversion, the following format choices are available:
Anamorphic: full-screen “stretched” image
Letterbox: image is reduced with black top and bottom added to image area with the
aspect ratio preserved
Crop: image is cropped to fit new screen size