played a avi nicely

Format : AVI
File size : 171 MiB
Overall bit rate : 4 499 Kbps
Bit rate : 4 430 Kbps
Width : 1 280 pixels
Height : 528 pixels
Frame rate : 23.976 fps

CPU @ 720 MHz and DSP @ 430 MHz
both smartreflex on.


but MP4

Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
Width : 1 280 pixels
Height : 720 pixels

not smooth even at 1.15GHz DSP @ 600MHz