What is MPEG-2 Video Main Profile and Main Level?
A. MPEG-2 Video Main Profile and Main Level is analogous to MPEG-1’s CPB,with sampling limits at CCIR 601 parameters (720 x 480 x 30 Hz). Profiles limit syntax (i.e. algorithms), whereas Levels place limits on coding parameters (sample rates, frame dimensions, coded bitrates, etc.). Together, Video Main Profile and Main Level (abbreviated as MP@ML) normalize complexity within feasible limits of 1994 VLSI technology (0.5 micron), yet still meet the needs of the majority of application users.MP@ML is the conformance point for most cable and satellite systems. Profiles ====== Simple: I and P pictures only. 4:2:0 sampling ratio. 8,9, or 10 bits DC precision. Main: I, P, and B pictures. Dual Prime with no B-pictures only. 4:2:0 sampling ratio. 8, 9, or 10 bits sample precision. SNR profile: Spatial profile: High: 8,9,10, or 11 bits sample precision. 4:2:2 and 4:4:4 sampling ratio. Level ==== Simple: SIF video rate (3.041280 Mhz), 4 Mbit/sec, 0.489472 Mbit VBV buffer, 64 vertical in frame, 3
