User`s guide

Chapter 4 Working with Effects and Filters
194
Previewing to RAM
Previewing to RAM (PTR) defaults are set in the Preview tab of the Preferences window.
PTR plays in the Composite window only if the Timeline or the Controls is active. PTR
plays back the effect or animation in real time without rendering to disk. Your system plays
as much of the effect as possible depending on your system’s available memory.
The effect or animation plays slowly as Avid FX caches every frame. After the first time the
effect plays in real time. Preview to RAM plays from the current position of the position
indicator forward. It plays once, loops play, or plays forward and back, depending on the
Loop setting in the Composite window. See “Playback Controls” on page 71 for information
on the Loop setting.
The PTR Range submenu includes the following options.
• In To Out previews the frames between the current In and Out Marks.
• From CTI previews from the position of the CTI to the end of the composition.
• To CTI previews from the beginning of the composition to the position of the CTI, in
reverse order.
• Around CTI previews from a set number of frames before the CTI to the same number
of frames. You set the number of frames in the Preview tab of the Preferences window.
• Between User Marks previews the area between two user marks. The CTI must be
between the two user marks. If the composition includes only a single user mark, the
first frame and the last frame count as user marks.
• Entire Composition previews the entire composition.
When PTR is interrupted, the program immediately plays or loops the rendered region.
To preview effects and
animation Do this
In the current Preview window Select Preview > Preview to RAM to play back in real
time without rendering to disk.
At half rate Select Preview > Preview to RAM at Half Rate to
preview every other frame.
At quarter rate Select Preview > Preview to RAM at Quarter Rate to
preview every fourth frame to RAM.
on an external video monitor Select Preview > Preview to RAM on Monitor. This
option is not available in all host applications.