Magewell Pro Convert for NDI to HDMI 4K User Manual page 61

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Alpha display
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Note: This feature is ONLY supported by the NDI to HDMI 4K decoder.
Set the background displayed in images where an alpha channel is present.
Options are Alpha only, Alpha blend with white, Alpha blend with black
and Alpha blend with checkerboard.
Deinterlace
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Convert an interlaced source video into a progressive one using Weave or
Bob method.
Weave takes pairs of fields and puts them together (every other line)
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to one frame. The result is the same as no deinterlacing. This mode is
used when users want to capture the original video.
Bob blends the top and bottom & field together. By default, this is
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used.
Source stream
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Check the box to decode streams when the network bandwidth is too low to
have a smooth video. Generally, if the resolution is higher than 2048 x 1080,
the height and width will be reduced to a quarter of the original, that is
one-sixteenth of the original resolution; otherwise the height and width will
be reduced to half of the original value, that is one-quarter of the original
resolution. Meanwhile, the frame rate will drop to about 15 FPS. By default,
it is off.