| フィールド | 型 | コメント |
| PictureStartCode | UB[17] |
Similar to H.263 5.1.1 0000 0000 0000 0000 1 |
| Version | UB[5] |
Video format version Flash Player 6 supports 0 and 1 |
| TemporalReference | UB[8] | See H.263 5.1.2 |
| PictureSize | UB[3] |
000: custom, 1 byte 001: custom, 2 bytes 010: CIF (352x288) 011: QCIF (176x144) 100: SQCIF (128x96) 101: 320x240 110: 160x120 111: reserved |
| CustomWidth |
If PictureSize = 000, UB[8] If PictureSize = 001, UB[16] Otherwise absent Note: UB[16] is not the same as UI16; there is no byte swapping. |
Width in pixels |
| CustomHeight |
If PictureSize = 000, UB[8] If PictureSize = 001, UB[16] Otherwise absent Note: UB[16] is not the same as UI16; there is no byte swapping. |
Height in pixels |
| PictureType | UB[2] |
00: intra frame 01: inter frame 10: disposable inter frame 11: reserved |
| DeblockingFlag | UB[1] |
Requests use of deblocking filter (advisory only, Flash Player may ignore) |
| Quantizer | UB[5] | See H.263 5.1.4 |
| ExtraInformationFlag | UB[1] | See H.263 5.1.9 |
| ExtraInformation |
If ExtraInformationFlag = 1, UB[8] Otherwise absent |
See H.263 5.1.10 |
| ... |
The ExtraInformationFlag- ExtraInformation sequence repeats until an ExtraInformationFlag of 0 is encountered |
|
| Macroblock | MACROBLOCK | See following |
| PictureStuffing | varies | See H.263 5.1.13 |
| フィールド | 型 | コメント |
| CodedMacroblockFlag | UB[1] |
See H.263 5.3.1 If 1, macro block ends here |
| MacroblockType | varies |
See H.263 5.3.2 Can cause various fields (see following) to be absent |
| BlockPattern | varies | See H.263 5.3.5 |
| QuantizerInformation | UB[2] |
See H.263 5.3.6 00: -1 01: -2 10: +1 11: +2 |
| MotionVectorData | varies[2] |
See H.263 5.3.7 A horizontal code followed by a vertical code |
| ExtraMotionVectorData | varies[6] |
See H.263 5.3.8 Three more MotionVectorData code pairs are included when MacroblockType is INTER4V |
| BlockData | BLOCKDATA[6] |
See H.263 5.4 Four luminance blocks followed by two chrominance blocks |
| 7-bit LEVELs | 11-bit LEVELs | |||||
| Index | Level | Code | Index | Level | Code | |
| - | -64 | FORBIDDEN | - | -1024 | FORBIDDEN | |
| 0 | -63 | 1000 001 | 0 | -1023 |
1000 0000 001 |
|
| . | . | . | . | . | . | |
| 61 | -2 | 1111 110 | 1021 | -2 | 1111 1111 110 | |
| 62 | -1 | 1111 111 | 1022 | -1 | 1111 1111 111 | |
| - | 0 | FORBIDDEN | - | 0 | FORBIDDEN | |
| 63 | 1 | 0000 001 | 1023 | 1 |
0000 0000 001 |
|
| 64 | 2 | 0000 010 | 1024 | 2 |
0000 0000 010 |
|
| . | . | . | . | . | . | |
| 125 | 63 | 0111 111 | 2045 | 1023 | 0111 1111 111 |
