Apple Compressor 3 - Manual (Page 276)

Because interlacing creates two fields for each frame, areas with fast movement within
the field become separated into alternating jagged lines. You can view your source media
one frame at a time and check for horizontal stripes along the leading and trailing edges
of moving objects. If you find these, you need to deinterlace your source media to convert
it to a frame-based format.
Interlacing creates
a “comb” effect that
should be removed.
If your source media file needs to be converted to a frame-based format, you must
deinterlace it to remove the effects of interlacing. Interlacing on computer displays can
cause high-motion parts of your video to look fuzzy, so this is especially important if
you’re outputting a QuickTime movie for desktop or web playback. You can remove the
upper (odd) or lower (even) field from an interlaced video file, although smooth motion
may be compromised within the clip. This filter can also be used to eliminate flickering
caused by interlacing in still frames that have thin vertical lines, such as title pages with
small text. The remaining fields are interpolated to create a whole image, resulting in an
overall softening of the image.
About Reverse Telecine
The Deinterlace pop-up menu includes a setting for reversing the telecine.
276 Chapter 23 Working with Frame Controls