Hasta La Motion!

Hi, i got a clip , it’s a .mov code : xdcam hd422 1080p24 shoot on panasonic af100. If previewing this clip in quicktime player, i can see in the info window, it has data rate about 100Mbit/s and size : 288 mb. So i read the clip inside Nuke and directly apply the write node, set to the same codec and fps. But after i render, i found the data rate has been dropped to about 50Mbit/s and the filesize also dropped about half of the original size (140mb). It looks like the data/quaility has been reduced ??? Is there anyway i can keep the datarate so it won’t dropped when rendering out of Nuke. I couldn’t find any option to do it.

Thanx