289

Optimizing the Video Preview window

Timing and synchronization are critical aspects of any multimedia production. Because complex multimedia projects are challenging for any computer, a number of tools are provided to maintain real-time playback even though the computer may not be able to process the data quickly enough.

Reducing preview quality

You can adjust the resolution of the Video Preview window and the quality of the preview rendering in order to improve playback. Lower-resolution previews are less clear but allow more frames to be displayed per second. This may be particularly important with projects that use overlays, transitions, and effects. Click the Preview Quality button to choose different preview resolutions.

Note: To view the effects of the deinterlacing method you chose in your project properties, you will need to use the Good or Best quality preview mode. The Draft and Preview quality preview modes do not deinterlace.

Prerendering video

There are times where nothing but a full, high-quality preview will do. In these cases, Vegas software can take the time necessary to selectively render only the portions of your project that need extra processing. These sections are prerendered and short files are created to use for previews. The prerendering can take anywhere from a few seconds to a few minutes, depending on the length and complexity of the video.

Once these temporary files have been created, they are used whenever those sections of the project are played back, increasing playback quality and performance. As long as no changes are made to the events in the prerendered sections, the newly created files continue to be used for previews, even if changes are made to other sections of the project.

1.To prerender a portion of the project, create a selection containing the portion you want to prerender.

2.From the Tools menu, choose Selectively Prerender Video. The Prerender Video dialog appears.

CHP. 16

PREVIEWING AND ANALYZING VIDEO