can not see the video

[mzhongx]

HI everyone,

I am developing a c#.net project which need to play a video, I am using the libraries like C# Wrapper for libvlc 0.9.0 and libvlcnet

first I create a project to experiment with the wrappers, and I can play the videos perfect. then I tried it on the real project and I can only hear the audio, I cannot see the video.

is this something wrong with the drawing part?

does anyone knows the reason?