I use MPMoviePlayerController to play some Video and Audio streams on iPhone.
Sometimes some steams aren't available, so on iPhone OS 3.1 I get 4 "This movie could not be played" alerts, even if I catch all the notifications.
Can anyone tell me how to prevent this from happening?
I'm sorry to tell you that this is (to the best of my knowledge) not possible to do. I've dealt with the same issue too and even though I spent quite a lot of time investigating the issue, I couldn't find a solution.