About video uploading into server and then play that video.

Hi,

       I am developing an windows application using c# in vs2010. The main theme of that application is upload the video into server using FTP and then play that uploaded video from the server no from local system. I did this process using the WMP.dll. but only some videos are playing and some videos are not playing. i don't know why. i upload the Mp4 videos. but the Data Rates of that videos are different. the lowest data rate files are only playing in the player. high rated videos are not playing.

 

Is there any reason because of that data rates or any other problem is there.  i need suggestions from some one. replay me. 

 

Thanks in advance.