MPMoviePlayerViewController播放本地视频一直Loading问题

大致代码如下：

    NSString *path = [[NSBundle mainBundle]pathForResource:@"7491.mp4" ofType:nil];    NSURL *contentURL = [NSURL URLWithPath:path];    NSLog(@"%@",contentURL);    if (contentURL) {        _player = nil;        self.player.moviePlayer.contentURL = contentURL;        [self presentMoviePlayerViewControllerAnimated:self.player];    }

问题出在URL上，这里的URL需要用+ (NSURL *)fileURLWithPath:(NSString *)path;创建，而不能用urlWithString

费了好久才找到原因