iMove '11 publishing to YouTube problem

I attempted several times to publish a movie to YouTube, but nothing shows up on my YouTube channel. I went to the troubleshooting forum on YouTube, where it was suggested I try three times. When that wasn't successful, it was then suggested that I export the files outside of iMovie, then try to publish it manually using a YouTube publishing resource. I found that when I exported it out of iMovie, it was in the m4v format. YouTube doesn't support m4v.