08.01.2013 Views

DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

DigitalVideoAndHDTVAlgorithmsAndInterfaces.pdf

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Profile<br />

@Level<br />

High<br />

(HL)<br />

High-1440<br />

(H14)<br />

Main<br />

(ML)<br />

Low<br />

(LL)<br />

MPEG-1<br />

CPB<br />

† max 99 Kpx<br />

MPEG-1<br />

CPB<br />

768×576 †<br />

30 Hz<br />

1.856 Mb/s<br />

Simple<br />

(no B pictures)<br />

720×576<br />

30 Hz<br />

15 Mb/s<br />

Main<br />

(MP)<br />

1920×1088<br />

60 Hz<br />

80 Mb/s<br />

1440×1088<br />

60 Hz<br />

47 Mb/s<br />

720×576<br />

30 Hz<br />

15 Mb/s<br />

352×288<br />

30 Hz<br />

4 Mb/s<br />

4:2:2<br />

(422P)<br />

1920×1088<br />

60 Hz‡<br />

300 Mb/s‡<br />

720×608<br />

30 Hz<br />

50 Mb/s<br />

Table 40.1 MPEG-2 profiles, here arranged in columns, specify algorithmic features. (I exclude<br />

SNR, Spt, HP, and MVP.) MPEG-2 levels, here arranged in rows, constrain parameter values. Each<br />

entry gives maximum picture size, frame rate, and bit rate. The two shaded entries are commercially<br />

dominant: Main profile at main level (MP@ML) is used for SDTV distribution; main profile<br />

at high level (MP@HL) is used for HDTV distribution. SMPTE 308M places constraints on GOP<br />

structure for 422@HL. Any compliant MPEG-2 decoder must decode an MPEG-1 constrainedparameters<br />

bitstream (CPB); I include MPEG-1 CPB here as if it were a profile and a level.<br />

A combination is indicated by profile and level separated<br />

by an at sign, for example, MP@ML or MP@HL.<br />

The SNR, Spatial, High, and Multiview profiles have no<br />

relevance to video production or distribution, and they<br />

are unlikely to see significant commercial deployment.<br />

I won’t discuss them further.<br />

The profile and level combinations defined by<br />

MPEG-2 – excluding SNR, Spt, HP, and MVP – are<br />

summarized in Table 40.1 above. Excepting 422P, the<br />

combinations have a hierarchical relationship:<br />

A decoder claiming conformance to any profile must be<br />

capable of decoding all profiles to its left in Table 40.1;<br />

also, a decoder claiming conformance to any level must<br />

be capable of decoding all lower levels. Exceptionally,<br />

a simple profile at main level (SP@ML) decoder must<br />

be capable of decoding main profile at low level<br />

(MP@LL).<br />

CHAPTER 40 MPEG-2 VIDEO COMPRESSION 475

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!