Movie issues

ok so i just got an ipad and decided i wanted to try putting a movie on it so i converted a dvd with handbrake, and when i try to add the .mp4 file to itunes nothing happens. I tried dropping it in my movies section and also tried the add file command. it allows me to select the file to load then i click ok and nothing happens, after that I cant find it in itunes. Im pretty lost I know I have been able to do this before with my iphone but nothing is adding up now.

I selected apple universal as well. Im really mystified by this.

I set handbrake to place it in a folder where my picture folders are. Its extension is .mp4 the name is short and the size is just over 5 gig.

I just checked and it is a .m4v extension, it wont play in quicktime says its unsupported or something to that effect. I dont know what I am doing wrong, i select the dvd in the drive, select the format, apple universal, and select a destination and then it converts and about halfway thru it says its finished and nothing works.

The movie is Heat. I ended up ripping it in DVD decrypter and using videora to convert, which works perfectly. However that process isn't working for any other DVD. It will show up in iTunes but the picture is all messed up and the sounds play fine. It's gotta be a conversion issue cuz I can burn the iso image to a disc and it'll play fine in a playstation.