Objective c QTMovieModernizer错误

我正试图写一段代码来“现代化”一个视频文件。代码如下：

NSOpenPanel *openPanel = [[NSOpenPanel alloc] init];
[openPanel setCanChooseFiles:NO];
[openPanel setCanChooseDirectories:YES];

if([openPanel runModal] == NSCancelButton)
     return;
NSMutableString *destination = [[[openPanel URL] absoluteString] mutableCopy];
[destination appendString:@"/"];
[destination appendString:[self fileName:[url absoluteString] withExtention:NO]];
[destination appendString:@".m4v"];

QTMovieModernizer *modernizer = [[QTMovieModernizer alloc] initWithSourceURL:url destinationURL:[NSURL URLWithString:destination]];

[modernizer modernizeWithCompletionHandler:^{NSLog(@"Modernization complete to file %@ - error : %@",[modernizer destinationURL],[modernizer error]);}];

问题是我得到了一个

NSInvalidArgumentException

。我仔细检查了源url和目标url，它们似乎都没有问题。该错误似乎发生在初始化

QTMovieModernizer

实例时。这里会出什么问题

---

错误详细信息：

 NSInvalidArgumentException
(
        0   CoreFoundation                      0x00007fff82cdc25c __exceptionPreprocess + 172
1   libobjc.A.dylib                     0x00007fff84c8ae75 objc_exception_throw + 43
2   QTKit                               0x00007fff84fc4303 -[QTMovieModernizer createUniqueLegacyFilePath:extension:inDirectory:] + 0
3   MediaPlayer                         0x0000000100003bb9 -[AppDelegate modernize:] + 1097
4   MediaPlayer                         0x000000010000536f -[AppDelegate openFile:] + 879
5   AppKit                              0x00007fff8339d340 -[NSApplication sendAction:to:from:] + 327
6   AppKit                              0x00007fff833b82a8 -[NSMenuItem _corePerformAction] + 394
7   AppKit                              0x00007fff833b7fe4 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 117
8   AppKit                              0x00007fff8340748d -[NSMenu _internalPerformActionForItemAtIndex:] + 35
9   AppKit                              0x00007fff83407309 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 104
10  AppKit                              0x00007fff833ae0d6 NSSLMMenuEventHandler + 716
11  HIToolbox                           0x00007fff8b7d21d4 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 892
12  HIToolbox                           0x00007fff8b7d1787 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 385
13  HIToolbox                           0x00007fff8b7e5880 SendEventToEventTarget + 40
14  HIToolbox                           0x00007fff8b81b640 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueEventRef + 420
15  HIToolbox                           0x00007fff8b84e238 SendMenuCommandWithContextAndModifiers + 59
16  HIToolbox                           0x00007fff8b84e1e0 SendMenuItemSelectedEvent + 178
17  HIToolbox                           0x00007fff8b84e0bf _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 94
18  HIToolbox                           0x00007fff8b856095 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 718
19  HIToolbox                           0x00007fff8b855cc1 _HandleMenuSelection2 + 446
20  AppKit                              0x00007fff8332073c _NSHandleCarbonMenuEvent + 284
21  AppKit                              0x00007fff8317f6be _DPSNextEvent + 2170
22  AppKit                              0x00007fff8317ea2b -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122
23  AppKit                              0x00007fff83172b2c -[NSApplication run] + 553
24  AppKit                              0x00007fff8315d913 NSApplicationMain + 940
25  MediaPlayer                         0x0000000100008362 main + 34
26  libdyld.dylib                       0x00007fff830d95fd start + 1
27  ???                                 0x0000000000000003 0x0 + 3
   )

---

编辑：

我发现

-fileName:withExtension:

通过用空格替换

%20

返回一个字符串。处理此操作后，初始化时的异常消失，但在转换文件时出现以下错误：

  <<<< QTMovieModernizer >>>> FigFormatUtilsCreateFormatReader: Error -12848 from       FigFormatReaderCreateForStream
  <<<< QTMovieModernizer >>>> formatReaderForSourceURL: Error in FormatReaderForSourceURL: -12848

>FigFormatTutilsCreateFormatReader:来自FigFormatTreaderCreateForStream的错误-12848
>formatReaderForSourceURL:formatReaderForSourceURL中的错误：-12848

完整的错误消息是什么？@rmaddy这是完整的错误消息刚才

在此之前引发了一个未捕获的异常

。如果可以打印出完整的源和目标URL，它们是什么样子的？@MichaelDautermann变量在这里：

destination\uu NSCFString*@"file:///Users/Moray/Desktop//S1%20E01%20-%20车型年款%20第一个%20天。m4v“0x000068000A75240

，

url NSURL*@”file:///Users/Moray/Movies/Scrubs/Season%201/S1%20E01%20-%20车型年款%20第一个%20天.avi“0x00000067A340