Problem opening video files

Hi,
After giving up on trying to get GledPlay to work on my Windows CE 5.0 board I thought I would try it out on my Dell x51v. The sample worked fine until I wanted to try out the video class. More specifically all my calls to the "open" method return ReturnCode::ERROR_OPENING_VIDEO regardless of what kind of video I have tried, including ogg/theora created using ffmpeg2theora using the default settings as well as those suggested in the gledplay video documenation. I have also tried mpeg 2 files but I get the same result.
Any suggestions?
Cheers,
Clint
After giving up on trying to get GledPlay to work on my Windows CE 5.0 board I thought I would try it out on my Dell x51v. The sample worked fine until I wanted to try out the video class. More specifically all my calls to the "open" method return ReturnCode::ERROR_OPENING_VIDEO regardless of what kind of video I have tried, including ogg/theora created using ffmpeg2theora using the default settings as well as those suggested in the gledplay video documenation. I have also tried mpeg 2 files but I get the same result.
Any suggestions?
Cheers,
Clint