🚀 go-pugleaf

In article <1992Sep9.224534.11086@smsc.sony.com>, dce@smsc.sony.com
(David Elliott) asks about syncing multiple programs as part of a multimedia
presentation.

These sorts of capabilities are described in detail in the QuickTime
documentation. I must admit this is one area of QuickTime which I haven't
actually tried out, but here are some of the things the documentation leads
me to believe you can do:

      * You have "timebase" components and "clock" components.
	A "clock" is an actual time reference (such as a hardware clock),
	whereas a "timebase" is something you slave to a clock (or to another
	timebase). A timebase may also mark time at a rate other than 1:1
	relative to its master, and it may loop.
      * QuickTime 1.0 provides two standard clocks: the "tick" clock
	(60.15 ticks = 1 second) and the Time Manager microsecond clock
	(actual claimed resolution is 20 microseconds). You could define
	additional clock components, for example one that was just a slave
	to a central time service on a network.
      * You can attach callback routines to a clock or timebase component
	instance. A callback can be triggered at a specific time, at a specific
	time but only if time is moving in a particular direction (!), or on a
	change of rate of passage of time, or on a sudden jump in the
	current time value. You specify whether the callback is an interrupt
	or non-interrupt routine; the latter has more flexibility in what it
	is allowed to do when invoked, but the invocation latency is greater.
      * You can change the timebase or clock attached to a movie.
	For example, this could be used to synchronize the playback of
	a group of movies, without any further special action.

Lawrence D'Oliveiro                       fone: +64-7-856-2889
Computer Services Dept                     fax: +64-7-838-4066
University of Waikato            electric mail: ldo@waikato.ac.nz
Hamilton, New Zealand    37^ 47' 26" S, 175^ 19' 7" E, GMT+12:00
A copy of my new automatic enclosure-encoding software follows.