2011

or if you want to do a traditional field merge. The long answer is that if the
static region of the image is undergoing lighting changes, then you need to
use Linear to avoid alternating lines having different intensities. If the static
region is not undergoing lighting changes and is perfectly static, then you get
the same result whether you use Linear or Nearest. That is why you should
usually use Linear. However, if the static region has grain that changes from
frame to frame, then using Linear will blur this a bit (being the average of 2
fields), so you may want to switch to Nearest.
The other time one might want to use Nearest for Temporal interpolation is
when performing a traditional field merge. Here the user would set the Motion
Threshold and Motion Softness both to 0.0, which disables the Adaptive
deinterlacing. By setting the conversion to do Merge Fields and setting the
Temporal Interpolation to be Nearest, the final result is exactly equivalent to
a field merge, where each output line is a weighted sum of the corresponding
input line, and the lines above and below it, with weights of 0.5, 0.25, and
0.25 respectively.
Interlace
Use the Interlace tool to convert a sequence of progressive frames to an output
of interlaced video frames. Each pair of input frames result in one output
frame.
To convert progressive frames to interlaced frames:
1 Select either NTSC or Non-NTSC from the Format menu.
2 Select the field order. If the upper field is first, then the upper field is
taken from the first frame of the input pair and the lower field is taken
from the second frame of the input pair; otherwise, upper and lower fields
are reversed.
The output is always at the same frame rate as the input, and the action will
play twice as fast. You can always use a Rate Convert node before the Interlace
if needed. The following table shows how frames are interlaced. The input
frames are numbered consecutively from 1 as shown in the top part of the
table. Each output frame shows two numbers, which indicates the input frame
indices for field 1 and field 2 respectively.
Interlace | 801