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:
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—Vladimir Nabokov (1899–1977)
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—Henry Miller (1891–1980)