
12GM Mini-Converter v1.13 13 www.aja.com
Input Mapping
NOTE: Input pixel mapping applies only to 4K/UltraHD signals being transported on
Quad Link 4 x 3G inputs, as 6G and 12G SDI are always Two Sample Interleave
(2SI), and Quad Link 1.5G SDI is always Square Division (Quadrant).
For 4K/UltraHD signals using Quad Link 3Gbps transport, the Video Payload
Identifier (VPID) embedded in each link indicates whether the pixel mapping
is 2SI or not. If 2SI is not indicated, the 12GM assumes that the input signal is
mapped Square Division (Quadrant). Note that there are no specific VPID bits to
indicate Square Division (Quadrant).
Use the Input Mapping control to select the input mapping. Choose from the
following:
• Auto - Analyzes details of each input. The VPID from each input signal
indicates whether its pixel mapping is Two Sample Interleave (2SI) or Square
Division (Quadrant). In order for "Auto" to select 2SI pixel mapping, the video
input (whether single link 6G-SDI or 12G-SDI, or Quad Link 3G-SDI) must
indicate 2SI with its embedded VPID(s).
• 2SI - Select this option if you are inputting a Two Sample Interleave (2SI) pixel
mapped signal.
• SQD - Select this option if you are inputting a Square Division (Quadrant) pixel
mapped signal.
Video Format
This control can be used to force the 12GM's input video receiver to interpret
that incoming video signal as either Progressive, interlaced, or PsF (Progressive
Sequential Frame).
The default setting is Auto, in which the 12GM examines the incoming video
signal to determine which format is appropriate.
Choose from Auto, Progressive, Interlaced, or PsF.
• Auto - Automatically selects the format based on the input video parameters
and the payload ID.
• Interlaced - Forces the 12GM to interpret the incoming video as Interlaced.
• Progressive - Forces the 12GM to interpret the incoming video as Progressive.
• PsF - Forces the 12GM to interpret the incoming video as PsF.
Under normal circumstances you should always run in Auto mode. However,
because interlaced and PsF formats are essentially the same signal, the 12GM
might confuse them. For example, if you know for sure that you receiving a PsF
signal, but the 12GM is interpreting it as an Interlaced signal while running in Auto
mode, setting this control to PsF will force the receiver to interpret that signal
as PsF. However, if the 12GM is receiving a Progressive signal and you force it to
interpret it as Interlaced, an invalid output video signal will be created.
Bit Depth
Selects the input video bit depth. Choose Auto, 10-bit, or 12-bit. Choosing “Auto”
automatically selects the bit depth based on the input video parameters and the
payload ID.