Levels
As the term is used in the standard, a "level" is a specified set of constraints that indicate a degree of required decoder performance for a profile. For example, a level of support within a profile specifies the maximum picture resolution, frame rate, and bit rate that a decoder may use. A decoder that conforms to a given level must be able to decode all bitstreams encoded for that level and all lower levels.
| Level |
Max decoding speed | Max frame size | Max video bit rate for video coding layer (VCL) kbit/s | Examples for high resolution @ highest frame rate (max stored frames) |
||||
|---|---|---|---|---|---|---|---|---|
| Luma samples/s | Macroblocks/s | Luma samples | Macroblocks | Baseline, Extended and Main Profiles |
High Profile | High 10 Profile | ||
| 1 | 380,160 | 1,485 | 25,344 | 99 | 64 | 80 | 192 | 128×96@30.9 (8) 176×144@15.0 (4) |
| 1b | 380,160 | 1,485 | 25,344 | 99 | 128 | 160 | 384 | 128×96@30.9 (8) 176×144@15.0 (4) |
| 1.1 | 768,000 | 3,000 | 101,376 | 396 | 192 | 240 | 576 | 176×144@30.3 (9) 320×240@10.0 (3) 352×288@7.5 (2) |
| 1.2 | 1,536,000 | 6,000 | 101,376 | 396 | 384 | 480 | 1,152 | 320×240@20.0 (7) 352×288@15.2 (6) |
| 1.3 | 3,041,280 | 11,880 | 101,376 | 396 | 768 | 960 | 2,304 | 320×240@36.0 (7) 352×288@30.0 (6) |
| 2 | 3,041,280 | 11,880 | 101,376 | 396 | 2,000 | 2,500 | 6,000 | 320×240@36.0 (7) 352×288@30.0 (6) |
| 2.1 | 5,068,800 | 19,800 | 202,752 | 792 | 4,000 | 5,000 | 12,000 | 352×480@30.0 (7) 352×576@25.0 (6) |
| 2.2 | 5,184,000 | 20,250 | 414,720 | 1,620 | 4,000 | 5,000 | 12,000 | 352×480@30.7(10) 352×576@25.6 (7) 720×480@15.0 (6) 720×576@12.5 (5) |
| 3 | 10,368,000 | 40,500 | 414,720 | 1,620 | 10,000 | 12,500 | 30,000 | 352×480@61.4 (12) 352×576@51.1 (10) 720×480@30.0 (6) 720×576@25.0 (5) |
| 3.1 | 27,648,000 | 108,000 | 921,600 | 3,600 | 14,000 | 17,500 | 42,000 | 720×480@80.0 (13) 720×576@66.7 (11) 1280×720@30.0 (5) |
| 3.2 | 55,296,000 | 216,000 | 1,310,720 | 5,120 | 20,000 | 25,000 | 60,000 | 1,280×720@60.0 (5) 1,280×1,024@42.2 (4) |
| 4 | 62,914,560 | 245,760 | 2,097,152 | 8,192 | 20,000 | 25,000 | 60,000 | 1,280×720@68.3 (9) 1,920×1,080@30.1 (4) 2,048×1,024@30.0 (4) |
| 4.1 | 62,914,560 | 245,760 | 2,097,152 | 8,192 | 50,000 | 62,500 | 150,000 | 1,280×720@68.3 (9) 1,920×1,080@30.1 (4) 2,048×1,024@30.0 (4) |
| 4.2 | 133,693,440 | 522,240 | 2,228,224 | 8,704 | 50,000 | 62,500 | 150,000 | 1,280×720@145.1 (9) 1,920×1,080@64.0 (4) 2,048×1,080@60.0 (4) |
| 5 | 150,994,944 | 589,824 | 5,652,480 | 22,080 | 135,000 | 168,750 | 405,000 | 1,920×1,080@72.3 (13) 2,048×1,024@72.0 (13) 2,048×1,080@67.8 (12) 2,560×1,920@30.7 (5) 3,672×1,536@26.7 (5) |
| 5.1 | 251,658,240 | 983,040 | 9,437,184 | 36,864 | 240,000 | 300,000 | 720,000 | 1,920×1,080@120.5 (16) 2,560×1,920@51.2 (9) 3,840×2,160@31.7 (5) 4,096×2,048@30.0 (5) 4,096×2,160@28.5 (5) 4,096×2,304@26.7 (5) |
| 5.2 | 530,841,600 | 2,073,600 | 9,437,184 | 36,864 | 240,000 | 300,000 | 720,000 | 1,920×1,080@172.0 (16) 2,560×1,920@108.0 (9) 3,840×2,160@66.8 (5) 4,096×2,048@63.3 (5) 4,096×2,160@60.0 (5) 4,096×2,304@56.3 (5) |
The maximum bit rate for High Profile is 1.25 times that of the Base/Extended/Main Profiles, 3 times for Hi10P, and 4 times for Hi422P/Hi444PP.
The number of luma samples is 16x16=256 times the number of macroblocks (and the number of luma samples per second is 256 times the number of macroblocks per second).
Read more about this topic: H.264/MPEG-4 AVC
Famous quotes containing the word levels:
“When I turned into a parent, I experienced a real and total personality change that slowly shifted back to the “normal” me, yet has not completely vanished. I believe the two levels are now superimposed, with an additional sprinkling of mortality intimations.”
—Sonia Taitz (20th century)
“The word which gives the key to the national vice is waste. And people who are wasteful are not wise, neither can they remain young and vigorous. In order to transmute energy to higher and more subtle levels one must first conserve it.”
—Henry Miller (1891–1980)
“Pushkin’s composition is first of all and above all a phenomenon of style, and it is from this flowered rim that I have surveyed its seep of Arcadian country, the serpentine gleam of its imported brooks, the miniature blizzards imprisoned in round crystal, and the many-hued levels of literary parody blending in the melting distance.”
—Vladimir Nabokov (1899–1977)