4.2

choose “Faster encode (Single-pass).” Click OK, then click the
“Field order” pop-up menu and choose an interlace option
(Top First or Bottom First).
Add clean aperture information: Select this checkbox to define
clean picture edges in the output file. To do this, information is
added to the output file to define how many pixels to hide,
ensuring that no artifacts appear along the edges. When you
play the output file in QuickTime Player, the pixel aspect ratio
will be slightly altered; however, note that this process does
not affect the actual number of pixels in the output file—it only
controls whether information is added to the file that a player
can use to hide the edges of the picture.
QuickTime settings: You can change the type of video
compression by clicking the Change button and using the
controls in the Standard Video Compression Settings window
to modify the compression as appropriate. After you click OK
and close the window, the setting’s video properties update to
show your changes.
When QuickTime settings are set to H.264, a few additional
controls appear:
Data rate: This pop-up menu allows you to choose a data rate
for your video based on any of four options:
Custom: Enables a value field to set the number of
kilobytes per second (kbps) to which you want to limit your
video signal. Higher rates allow higher-quality video, but
generate larger files that are slower to download or
transmit.
Computer playback: Creates a larger file with higher
quality.
Web publishing: Creates a smaller file (of lower quality)