| Tech | H.264 | MPEG4 |
| I-frame prediction | 4x4:9 types, 16x16: 4 types | N/A |
| p-frame prediction | 16x16:7 types 16x8,8x8,8x4, 4x8, 4x4 | 16x16, 8x8 |
| transformation | 4x4 integer | 8x8 DCT |
| entropy encoder | CAVLC, CABAC | Huffman |
| loop filter | Yes | No |
[update:9/16/2010]
Of course MPEG4 has I-frame too.
H264 uses multiple reference frames for inter-prediction. It uses weighted prediction
H264 use quarter-pixel motion (six-tap filtering for half-pixel, linear interpolation for quarter pixel). [#]
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