Apple Final Cut Express HD - Manual (Page 875)

Chapter 59 Using RT Extreme 875
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 Playback Video Quality: Some codecs, such as DV, allow you to choose from several
resolutions during playback. Selecting a higher playback quality will reduce the
number of simultaneous real-time effects you can play.
 Dynamic: This option allows Final Cut Express HD to automatically change between
High, Medium, and Low quality as necessary to maintain real-time playback. In this
case, the quality of the video resolution can change frame by frame.
 High: Guarantees full-frame, full-resolution video playback. Video interlacing
is preserved.
 Medium: Displays every other pixel and every other line (this is known as quarter
frame resolution). Because only half the lines are shown, the video is displayed non-
interlaced. Media is decompressed using a full quality decompression algorithm.
 Low: Quarter frame resolution just like medium resolution. However, your media is
decompressed and displayed with a low-quality decompression algorithm which
requires significantly less processing power.
 Play Base Layer Only (if render needed): If this option is selected, Final Cut Express HD
ignores effects processing altogether in areas of your sequence where the applied
video effects require rendering for playback (indicated by a red render bar). Motion
effects or video filters are ignored and the clip’s original media file is shown without
any processing. If you have multiple tracks of composited video, only the video clip
item on the lowest-numbered visible video track plays back—all other layered video
items are ignored.
This option also affects audio playback. When playing over an unrendered portion of
a sequence, no effects are played back. The number of audio tracks that play
depends on whether or not you have selected the Play Base Layer Only option.
 If selected: The first two tracks of audio play back.
 If unselected: The number of audio tracks that play back is determined by the
number of real-time audio tracks you have set in the General tab of the User
Preferences window.
 Beep When Playing Unrendered Audio: This option is only available in the Playback
Control tab of the System Settings window. When this option is enabled, audio clip
items that require rendering are played back as audible beeps. This is the audio
equivalent to the “Unrendered” screen you see when your video requires rendering.
If the Play Base Layer Only option is enabled, the beeps are not heard.