Information Technology - Generic Coding of Moving Pictures and Associated Audio Information - Part 6: Extensions for DSM-CC - First Edition; Technical Corrigendum 1: 11-01-1999; Amendment 2: 06-01-2000; Amendment 1: 10-15-2000; Amendment 3: 08-15-2001; Technical Corrigendum 2: 8/15/2002; Technical Corrigendum 1 to Amendment 1: 10/01/02