Question

我想在ios设备上导出带有objective-c的.mov文件，这是我的代码：

- (void)viewDidLoad {
    [super viewDidLoad];

    //NSURL *videoUrl = [[NSBundle mainBundle] URLForResource:@"4a213c6f-d038-494c-bed2-07ed50aef5ac" withExtension:@"mov"];

    NSURL *videoUrl = [NSURL URLWithString:@"http://gamecdn.gifmiao.com/wallpaper/4a213c6f-d038-494c-bed2-07ed50aef5ac.mov"];

    AVURLAsset *assets = [[AVURLAsset alloc] initWithURL:videoUrl options:nil];

    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:assets presetName:AVAssetExportPresetPassthrough];

    NSURL *exportUrl = [[[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory
                                                                inDomains:NSUserDomainMask] lastObject] URLByAppendingPathComponent:@"export.mov"];

    exportSession.outputFileType = AVFileTypeQuickTimeMovie;
    exportSession.outputURL = exportUrl;

    [exportSession exportAsynchronouslyWithCompletionHandler:^{

        if(exportSession.status == AVAssetExportSessionStatusCompleted){
            NSLog(@"export successfully at :%@", exportUrl);
        }else if(exportSession.status == AVAssetExportSessionStatusFailed){
            NSLog(@"export failed error is %@", [exportSession.error description]);
        }
    }];

    // Do any additional setup after loading the view, typically from a nib.
}

问题在于，当我使用URL作为http链接构建AVURLAsset时，导出将失败并显示错误：

Error Domain=AVFoundationErrorDomain Code=-11838 "Operation Stopped" UserInfo={NSLocalizedFailureReason=The operation is not supported for this media., NSLocalizedDescription=Operation Stopped, NSUnderlyingError=0x60400024b820 {Error Domain=NSOSStatusErrorDomain Code=-12109 "(null)"}}

也出现了这个错误：

Task <0F298017-8D66-4ADB-8D65-5656FD256DA4>.<2> finished with error - code: -999

但是当我下载视频文件并将其放入主包的资源（只是拖放到Xcode项目中）时，一切都会正常工作。

为什么会这样，以及如何解决这个问题？

AVAssetExportSession无法导出，因为操作不支持媒体

0 个答案: