Look at the reply to your previous post.
And please try to give just a little more detail about what you're looking for: what exactly it is you're trying to do. The extra "context" will help answer your questions more intelligently ;-)
PS:
Your question about "PST" suggests that maybe you're interested in MPEG-2. Here's a good overview on that particular subject:
http://erg.abdn.ac.uk/research/futur...deo/mpeg2.html
