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:
“The only inequalities that matter begin in the mind. It is not income levels but differences in mental equipment that keep people apart, breed feelings of inferiority.”
—Jacquetta Hawkes (b. 1910)
“Almsgiving tends to perpetuate poverty; aid does away with it once and for all. Almsgiving leaves a man just where he was before. Aid restores him to society as an individual worthy of all respect and not as a man with a grievance. Almsgiving is the generosity of the rich; social aid levels up social inequalities. Charity separates the rich from the poor; aid raises the needy and sets him on the same level with the rich.”
—Eva Perón (1919–1952)
“The country is fed up with children and their problems. For the first time in history, the differences in outlook between people raising children and those who are not are beginning to assume some political significance. This difference is already a part of the conflicts in local school politics. It may spread to other levels of government. Society has less time for the concerns of those who raise the young or try to teach them.”
—Joseph Featherstone (20th century)