It’s Easy to Generate Flash Video
You don’t create video using Flash Video. Say what? Let me explain: You create video using programs like iMovie, Windows Movie Maker, Flash (for animation), or other programs that come with your digital movie camera, or your computer. Or, you might use a professional quality digital video-editing program like Adobe Premiere Pro CS3. In any case, these programs allow you to capture and edit video, add effects, and then produce ready-to-watch video in formats like WMV or MOV.
After you create a video in a format like WMV or MOV, you export that video to Flash Video (FLV) format using the Flash CS3 Video Encoder.
Flash Video Encoder is a stand-alone program that is bundled in Adobe’s CS3 suite with Flash CS3 (we’ll see if Adobe detaches “Flash” Video Encoder from Flash in CS4, and makes it available as a discrete product).
Flash Video Encoder loads files and then allows you to make some additional edits. For example, you can use Flash Video Encoder to trim the length of your video—handy when the DVD version of your video runs three hours and you want to create a three-minute trailer for the web. Flash Video Encoder also crops videos, so you can cut excess pixels from the top, bottom, and/or sides of the video.

Figure 2 Cropping pixels from the top, bottom, left, and right sides of the video, and trimming video length in Flash Video Encoder.