User`s guide

AVoption & AVoption XL Guide42
Undo/Redo for Video Editing
Commands
You can undo or redo the single most recent
video editing command, including Add Movie,
Clear Selection, Move Clip, Copy Clip, and Clip
Capture. If there are already video clips on the
Movie track, and you record or edit over them,
the overwritten material is removed from the
Movie track. You can undo the video editing
command and restore the original clips.
Undo/Redo works only for the single most re-
cent video editing command. You cannot
undo/redo once a new video editing command
has been performed or the session has been
closed and reopened.
To undo the most recent video editing command:
• Choose Movie > Undo.
To redo the command, choose Movie > Redo.
If you have captured, added or moved a clip
onto a pre-existing clip and consequently trun-
cated it, Undo will also restore the trimmed clip
to its original length.
Performance Guidelines
Virtually all testing for AVoption and
AVoption XL was done with:
• A baseline of 32 tracks (of 24–bit/48k audio).
• One stream of the highest resolution of video
data (record or playback) of which the prod-
uct is capable (AVR77 for AVoption and 1:1—
or uncompressed—for AVoption XL).
These test configurations generally included
one drive for every 16 tracks of audio in addition
to separate storage devices for video. One way to
achieve higher track counts is to dedicate more
drives to the audio tracks.
On a supported configuration, you should be
able to easily achieve this performance baseline,
even with a high degree of edit density on each
track. The higher the edit density, the more
heavily taxed the storage system.
You may find better results than this baseline,
since Digidesign’s performance tests are de-
signed to stress the storage subsystem more
heavily than the average “real world” usage. You
may be able to continuously record or play back
64 audio tracks and picture simultaneously.