Save video in photos album

[arun]

Hi,
I receive a mp4 video data from the server and i need to store that mp4 video in iphone device photos album.And i try it with the

UISaveVideoAtPathToSavedPhotosAlbum(databaseFile,self, @selector(video:didFinishSavingWithError:contextInfo:),nil);

but it shows error of invalid data.Also i storing it in application path and it is taken in databaseFile object which is shown above.Can any one guide me.