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Reference Guide

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Video playback, import, and export
Controlling Playback
• If you intend to do a lot of seeking around or looping and editing while a video file is loaded, make
sure that your video file has sufficient keyframes. Since each frame has to be computed from the
last keyframe encountered, if you have very few keyframes in the video, performance may be
slow. To change the number of keyframes, you may recompress the file using the File > Export
Video command and specify more frequent keyframes. Choose a suitable video compressor
such as Cinepak and change the KeyFrame Rate parameter to a number between 1-5. A value of
1 makes every frame a keyframe, and higher numbers insert a keyframe after that many frames.
• Changing the video properties of an AVI file, such as Trim and Start time, can make realtime
performance slightly slower. You can make these changes permanent (and thereby reduce the
load on your CPU) by using the File > Export Video command, and then re-importing the file.
• Playing videos at a resolution (video size) of 320x240 is usually a high enough resolution to
monitor the video while you’re composing a soundtrack. You can still choose to stretch the video
to full screen at this resolution. You set the video size on the Render Quality tab of the Video
Properties dialog. Using a higher resolution can bog down your computer if you’re processing
audio tracks at the same time.
See also:
Using the Video thumbnails pane
Using the Video thumbnails pane
At the top of the Track view in SONAR is the Video Thumbnails pane, which displays individual
frames of your video at certain time intervals of your project. The time interval between displayed
frames is determined by the zoom level you choose. If you zoom in far enough, you can view each
individual frame of your video.
Note 1: If you’re playing back a highly compressed movie (not many keyframes in the file), it
can take about a minute to redraw video thumbnails when you’re playing the movie or resizing
a window.
Note 2: Some Windows Media videos do not report their frame rate to SONAR. SONAR can
play these files, but cannot create thumbnails from them, so no thumbnails appear in the
Thumbnail pane.