Introduction

ScreenShow Pro Overview

Video Basics

Cursor Options

Keyboard Shortcuts

Autopan

Setting Regions

Video Options

Audio Options

Program Options

Screen Annotations

Video Basics

Every AVI movie is a sequence of bitmaps (known as frames). When you record a movie using the ScreenShow Pro you are actually saving this sequence of bitmaps which are then played in a rapid succession to give the impression of motion. The number of frames recorded per second is called the frame rate. If the frame rate is high the video will play smoother but the resulting AVI file will be larger in size.

There are 3 kinds of rates:
The input rate is the number of frames that your computer records in a second.
The output rate is the number of frames displayed in a second when you are playing the AVI.

The two rates are usually the same. However, you might want to play the video faster than you’ve recorded it, or, on the contrary, play it slower. In the first case you’ll have to set the output rate to be bigger than the input rate, and vice versa for the second scenario.

The key frame rate. There are two ways of saving a frame in an AVI file: you can either save it as a full frame (a complete image) or you can save only the differences that occurred from the last frame. This key frame rate specifies how often full frames are written to the AVI file. A high value means you can fast forward/rewind to a particular frame in your movie much faster. But it also means a larger file size.

ScreenShow Pro's Recorder Module allows you to specify these video rates to match you exact needs. Video options will be review in the Video Options section.