Urgent Video problem: No video - only sound

NOTE: ONLY bid if you can get started and complete this project right away. This project is urgent. Hi, I'm trying to add a video (.mp4) to my site using easyvideoplayer and flowplayer but both of them only play the audio, no sound. I've come to the conclusion that the file probably needs to be converted to another type of file (h.264??) using WinFF or some similar program. Need someone who can help me make this video play properly. The video also loads for like 1 minute before it starts playing, this may have to do with the wrong file format, otherwise I need help with this as well. Thanks, Jakob