Legal values are true or false. The default is false. This is used to give QuickTime enough information to decide how far in advance to begin loading a media element to provide seamless playback.
Possible values are positive integers, in bits per second.
Use system-bitrate to select a media element based on the user's connection speed. Valid values are any character string. Use this to create named points in your presentation that the viewer can jump to interactively. The chapter names appear as a pop-up list in the controller. This allows you to add a QuickTime chapter list to a SMIL presentation.