使用MPMoviePlayerController从服务器播放视频时出错

Question

我尝试使用此代码在服务器上播放视频。我有一个错误。

//Play the video from server
    - (IBAction)playVideo:(id)sender;
    {
        NNSURL *url = [[NSURL alloc]initWithString: aVideo.urlVideo];
NSLog(@"URLVIDEO %@", url);
MPMoviePlayerController *VideoPlayer = [[MPMoviePlayerController alloc]initWithContentURL: url];
[VideoPlayer play];      
    }

//控制台

URLVIDEO http://147.83.74.180/videos/low/ElTemps-index.m3u8
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Content URL must not be nil.'

aVideo.urlVideo在Video类上定义，当我解析xml文件时它获取一个值

//Video.h
NSString urlVideo;

//XMLParser.m
    [aVideo setValue:currentElementValue forKey:elementName]; //here i add the string

如果我这样做，我可以播放视频：

NSString *videoURL = @"http://147.83.74.180/videos/low/ElTemps-index.m3u8";
    MPMoviePlayerController *VideoPlayer = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL URLWithString:videoURL]];

Answer 1

aVideo.urlVideo不是有效的网址字符串。 NSURL是零。