急急急急iOS 短视频 OSS 上传视频AVURLAsset avcNaturalSize这个报错

[self getTestSTSEndpointBucketObjectWithFinishHandler:^{
        [uploader init:ossAccessKeyId accessKeySecret:ossAccessKeySecret secretToken:ossSecretToken expireTime:ossExpireTime listener:listener];
        
        NSLog(@"addFile clicked.");
        if (![self checkSTS]) {
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"缺少参数" message:@"请指定STS凭证,Bucket,Endpoint" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
            [alertView show];
            return;
        }
        
        //    NSString *name = [NSString stringWithFormat:@"%ld.demo.ios.mp4", pos];
        NSString *filePath = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"mp4"];
        
        VodInfo *vodInfo = [[VodInfo alloc] init];
        vodInfo.title = [NSString stringWithFormat:@"IOS标题%ld", pos];
        vodInfo.desc = [NSString stringWithFormat:@"IOS描述%ld", pos];
        vodInfo.cateId = @(19);
        vodInfo.coverUrl = [NSString stringWithFormat:@"http://www.taobao.com/IOS封面URL%ld", pos];
        vodInfo.tags = [NSString stringWithFormat:@"IOS标签1%ld, IOS标签2%ld", pos, pos];
        NSString *ossObject = [NSString stringWithFormat:@"%@%ld.ios.demo.mp4",ossPrefix,pos];
        [uploader addFile:filePath endpoint:ossEndPoint bucket:ossBucketName object:ossObject vodInfo:vodInfo];
        //    [uploader addFile:filePath endpoint:ossEndPoint bucket:ossBucketName object:ossObject];
        
        [percentList addObject:[NSString stringWithFormat:@"%d", 0]];
        NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:0];
        [_tableFiles reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];
        pos++;
    }];

- (IBAction)addFile:(id)sender {
    [uploader start];
}

调用sdk 就
-[AVURLAsset avcNaturalSize]: unrecognized selector sent to instance 0x600000424ae0
2018-03-18 13:13:55.964985+0800 osstest[69251:7873380] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AVURLAsset avcNaturalSize]: unrecognized selector sent to instance 0x600000424ae0'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010b14512b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x0000000109c4af41 objc_exception_throw + 48
    2   CoreFoundation                      0x000000010b1c6024 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
    3   CoreFoundation                      0x000000010b0c7f78 ___forwarding___ + 1432
    4   CoreFoundation                      0x000000010b0c7958 _CF_forwarding_prep_0 + 120
    5   osstest                             0x0000000108f76089 -[VODUploadClient sendStartEvent] + 420
    6   osstest                             0x0000000108f71291 -[VODUploadClient initMultiUpload] + 379
    7   osstest                             0x0000000108f70f5f -[VODUploadClient next] + 1057
    8   osstest                             0x0000000108f7000f -[VODUploadClient start] + 229
    9   osstest                             0x0000000108f6ad4e -[VODUploadDemo start] + 46
    10  osstest                             0x0000000108f627cc -[ViewController test] + 76
    11  UIKit                               0x000000010bf9c972 -[UIApplication sendAction:to:from:forEvent:] + 83
    12  UIKit                               0x000000010c11bc3c -[UIControl sendAction:to:forEvent:] + 67
    13  UIKit                               0x000000010c11bf59 -[UIControl _sendActionsForEvents:withEvent:] + 450
    14  UIKit                               0x000000010c11ae86 -[UIControl touchesEnded:withEvent:] + 618
    15  UIKit                               0x000000010c012807 -[UIWindow _sendTouchesForEvent:] + 2807
    16  UIKit                               0x000000010c013f2a -[UIWindow sendEvent:] + 4124
    17  UIKit                               0x000000010bfb7365 -[UIApplication sendEvent:] + 352
    18  UIKit                               0x000000010c903a1d __dispatchPreprocessedEventFromEventQueue + 2809
    19  UIKit                               0x000000010c906672 __handleEventQueueInternal + 5957
    20  CoreFoundation                      0x000000010b0e8101 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    21  CoreFoundation                      0x000000010b187f71 __CFRunLoopDoSource0 + 81
    22  CoreFoundation                      0x000000010b0cca19 __CFRunLoopDoSources0 + 185
    23  CoreFoundation                      0x000000010b0cbfff __CFRunLoopRun + 1279
    24  CoreFoundation                      0x000000010b0cb889 CFRunLoopRunSpecific + 409
    25  GraphicsServices                    0x00000001113079c6 GSEventRunModal + 62
    26  UIKit                               0x000000010bf9b5d6 UIApplicationMain + 159
    27  osstest                             0x0000000108f6389f main + 111
    28  libdyld.dylib                       0x000000010e69ad81 start + 1
    29  ???                                 0x0000000000000001 0x0 + 1
)