Autodesk 64006-051108-9001 User Guide - Page 195

Encode Tab 187 Video Length Use this formula to calculate the length of your video in seconds: videolength = (hh × 3600) + (mm × 60) + ss where, videolength hh, mm, and ss is the duration of the video in seconds represent the hours, minutes, and seconds of the video length When performing these calculations, do not forget to reserve enough space for the other components of your project. For example, a Director projector, ReadMe and installers might take 50 MB of the CD, leaving you only 600 MB for video. If you want to put two hours of video on a 4x CD, and your other project files are 50 MB, the data rate you must use is about 85 KBytes/sec or less (the CD 614,400 KB divided by 7,200 seconds equals 85.3 KBytes/sec). Minimum Target CPU Speed Most streaming codecs, such as the QuickTime Sorenson Video and Windows Media Video, are very CPU intensive. When using these codecs the limiting factor for the data rate may be the minimum system on which you want the video to play and not the connection speed or amount of video you need to fit on a disk. For example, the Sorenson Video codec can produce very high-quality video at CD-ROM data rates. But, as the data rate increases, the playback requirement also increases, so it is possible to produce higher-data rate movies that do not play smoothly on the minimum target CPU. For example, a 30 KBytes/sec Sorenson Video-encoded QuickTime movie plays well on any PowerMac or Pentium computer, but a 300 KBytes/sec Sorenson Video movie requires a fast computer to play smoothly. The latest Windows Media Video codec has similar playback requirements. Testing your material on the minimum target computer is important when using these newer, more CPU-intensive technologies.