Autodesk 64006-051108-9001 User Guide - Page 190

182 Chapter 8: Encoding Always use a frame rate that is an even divisor of the source frame rate; doing so produces much smoother motion. For example, if you have a 24 fps source file, only use frame rates of 6, 8 and 12 fps. Cleaner also supports decimal frame rates. Ideal NTSC-Derived Frame Rates 30 fps (all frames) 15 fps (every other frame) 10 fps (every third frame) 7.5 fps (every fourth frame) 6 fps (every fifth frame) 5 fps (every sixth frame) Technically, NTSC is 29.97 fps, not 30 fps. However, for movies displayed on the Web or in CD-ROM projects, you may not notice a difference between 30 fps and 29.97 fps. If you are creating video for broadcast, Cleaner properly supports 29.97 fps. Ideal PAL-Derived Frame Rates 25 fps (all frames) 12.5 fps (every other frame) 8.67 fps (every third frame) 6.25 fps (every fourth frame) 5 fps (every fifth frame) Frame Rates Derived for Film Projects 24 fps (all frames) 12 fps (every other frame) 8 fps (every third frame) 6 fps (every fourth frame) Same as Source Enable the Same as source checkbox to match the source media frame rate. Keyframes or Insert Keyframes Like frame rate, the keyframe frequency affects the image quality of the final encoded movie. How frequently you should set keyframes depends on the codec used, the content of the movie and how the movie is to be viewed.