RE: MPEG: Transport Stream vs. Program Stream
Chris O'Leary (coleary@heuris.com)
Fri, 23 Oct 1998 14:17:15 -0500
> One overarching point should be made re. multiplexers in
> general, and that is that one of their primary purposes in
> life is to guarantee audio/video sync. The excellence with
> which they stitch channels together (audio, video and private
> data) is generally to be judged by the quality of the A/V
> sync on large amounts of data - say over hours or days of
> continuous feed. It is possible to do this right, but not all
> multiplexers are created equal. At the design level, some
> subtle issues are involved.
This is a crucial point.
The real test of a multiplexer is successfully multiplexing hours of
stuff, not just minutes. Never be impressed by a successful mux of 5
seconds of audio and video. Watch for synchronization drift over the
course of an hour or more.
Chris O'Leary
V.P. of Marketing
Heuris