What is the difference between MPEG-4 & H.264? A rough answer is that video quality of latter is more beautiful, file size is smaller, and transmit speed is faster. It is easy to evaluate file size & transmit speed, but is it hard for amateur to distinguish video quality. In short, the smallest video block size of MPEG-4 is 8 x 8 pixel, but it of H.264 is 4 x 4 pixel. Therefore, edge is processed sharply.
As for image of MPEG-4, because its video block it four times bigger (8 / 4 = 2; 2 x 2 = 4), the color of edge would be illusively smeared. It reminds A-Mao of French impressionist painting.
Impression, Sunrise of Claude Monet
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