Release the mouse button. The clip will be transfered to this window. Normally, if you've trimmed the clip properly in the Clip window, you won't need to do additional editing in the Construction window. Simply drag the yellow bar over the entire clip using the red triangles at either end of the bar. Now it's time to reduce the size of the video clip by compressing it.
Compression is achieved through mathematical formulas known as codecs .
One way these codecs work is to look for pixels in the video that don't change from frame to frame and eliminate duplicates of those pixels. To compress your clip, first go to the Make pulldown menu and select Make Movie . Next, choose where you want to save the compressed file and what you want to name it. Look in the lower-left corner of the Make Movie window. Typically, we'll want to save the video clip at 15 frames per second with the audio fidelity set at 22khz, 8-bit Mono .