Gee, if I had a penny for everytime that’s happened to me. This type of problem often requires per-bases geekery. You’re probably more likely to get help from videohelp.com, since… well I think the name says it all.
First I would try opening the file with Media Info, and post your results. Also, try playing the video on your computer, and see if this happens on the computer, also.
That’s all I’ve got for now.
