The cartoon-like nature of my sample video works to the benefit of the LZW compression in the animated gif, and against the advantages of video and Sorenson. The reasons for my choice of frame rate was, at 10 frames per second the viewer has a slight perception of the individual frames. Frame rates higher than 15 frames per second results in larger files with no smoother appearance. Frequently authors want each frame to be percieved as a separate slice of data, and I have seen rates as low as 3 per second used to good effect. Higher settings should be used where quality is more important.
Lower numbers result in smaller file sizes.
Key frames are complete frames inserted into the video. The video codec compression used produces smaller files if only the first frame is a key frame, for static shots without zooms, pans, or cuts to new scenes. Making the movie platform independent. These choices are essential if you want PC or Unix users to be able to view your movies. However, you are cheating yourself if you do not take advantage of the free Gif Builder's superior editing tools.