Apple Final Cut Pro 6 - Manual (Page 1413)

628 Part IV Real Time and Rendering
Beep When Playing Unrendered Audio
This option is available only in the Playback Control tab of the System Settings window.
When this option is selected, audio clip items that require rendering are played back as
audible beeps. This is the audio equivalent of the “Unrendered” screen you see when
your video requires rendering. If the Play Base Layer Only option is not selected, the
beeps are not heard. For more information, see “
Play Base Layer Only ” on page 627.
Scrub High Quality
When this option is selected, video displayed in the Canvas is shown at full quality
when you scrub or when the video is stopped. If you deselect this option, the video
quality during scrubbing is determined by the current Playback Video Quality setting
(see “
Playback Video Quality ,” next). Deselecting this option allows you to improve
responsiveness during scrubbing, especially when using processor-intensive codecs
such as HDV, or options such as multiclip playback.
Playback Video Quality
Most codecs support more than one level of playback quality to improve real-time
performance. Some codecs support three playback quality levels—high, medium, and
low—while others support only high and low quality. Selecting a lower playback
quality can increase the number of simultaneous real-time effects you can play.
 Dynamic: This option allows Final Cut Pro 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. For more information,
see “
Multiclip Playback ” on page 630.
 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 without
interlacing. Media is decompressed using a full-quality decompression algorithm.
 Low: Like the Medium quality option, displays video at quarter frame resolution.
However, your media is decompressed and displayed with a low-quality
decompression algorithm, which requires significantly less processing power.