Experimenting some choppy movement in some HD movies

Hi ppl im not sure if this its the right place to post this...


but ill try im experimenting some choppy movement in some HD movies it looks like ghosting from the screen, but i think it only happens in the .mkv ones i recently brought a T220 screen which has 2ms of responce time and i dont see any ghosting in the video games i play i play Devil may cry pc version wich my Geforce 9800Gtx can top the Vsync at stable 60-59 FPS so i dont think it would be graphic card issue.

i watched the fast and furious 4 trailer on 1080p format without any sign of ghosting or choppy movement but the trailer its a short video of about 160 Mb and the file its a .mov it looks awesome.

but i have another 2 movies compresed in a MKV file im not sure what compresion its in it but the files are large one its about 4gb and the other its arround 1,7 gb in the smaller one theres better ilumination and the image looks awesome but it plays a bit shoppy when there its movement.

what could this be? may be the player or something else on my system

i have a Qx9650 at stock speed with a asus P5E3 deluxe and 2gb of ddr3 memory, Geforce 9800Gtx and a T220 Screen

its someone else experimenting the same its it common? could be compresion issue?

Thx in advance for the coments.