Apple Compressor (4.0) - Manual (Page 173)

Chapter 7 Advanced functions 173
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.
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
the file to remove the effects of interlacing. The best way to do so in Compressor is to use the
Deinterlace pop-up menu in the Frame Controls pane. (For more information, see
Frame Controls
pane on page 168.) Because interlacing on computer displays can cause high-motion parts of
your video to look fuzzy, deinterlacing 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. The
deinterlacing features in Compressor 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 in the Frame Controls pane includes a setting for reversing the
telecine of the source file.