MPMoviePlayer load and play movie saved in app doc

问题:

I am writing an application that stores the movies in the photo roll into the local documents folder for the app. I can play remote movies using the MPMoviePlayer, however trying to play a movie stored in the documents folder for the app always returns MPMovieLoadStateUnknown.

The notifications are all getting sent and received from the default notification center (MPMoviePlayerLoadStateDidChangeNotification, MPMoviePlayerPlaybackDidFinishNotification). An alert box shows up shortly after getting the loadStateUnknown message in the console, saying that the movie could not be played and the app then receives the movie playback completed notification.

I think that it may be a case that the filename (MPMoviePlayer can only take a URL as the asset location) cannot be found. Has anyone dealt with this issue or similar?

回答1:

Given that none of the other answers seem to resolve the problem, I'm inclined to think that the problem might be with the Documents file path you are producing.

You should be using the following method to generate the path to the application's documents folder:

NSString *userDocumentsPath = nil;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
if ([paths count] > 0) 
{
     userDocumentsPath = [paths objectAtIndex:0];
}

回答2:

have you tried converting the local file path to a url

[NSURL URLWithString: [NSString stringWithFormat:@"file:/%@//",filePath]];

if there are spaces in you file path, you will have to convert them prior to creating the URL

filePath = [filePath stringByReplacingOccurrencesOfString:@"/" withString:@"//"];
filePath = [filePath stringByReplacingOccurrencesOfString:@" " withString:@"%20"];

回答3:

The Core Data template converts a file path to a URL like this:

NSURL *storeUrl = [NSURL fileURLWithPath:whatever];

That seems to do all of the correct space escaping and stuff because I'm using this to load a file with a space in the path.

回答4:

I am not sure if this will help you. In this tutorial there are some code lines which probably will bring you on the right path:

    // Unless state is unknown, start playback
if ([mp loadState] != MPMovieLoadStateUnknown)
...

You will find this snippet in following method:

- (void) moviePlayerLoadStateChanged:(NSNotification*)notification 

here is the link to the tutorial: Tutorial

Hopefully this will help you...