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我在将 QTMovie 保存到硬盘驱动器中的文件时发现了奇怪的行为..（例如：桌面）...它显示了与开始时间帧图像不同的帧图像作为桌面中的预览.....但是如果我在“Quick Time Player”中打开保存的 QTMovie，它会在开始时显示正确的帧图像......

我怀疑这可能是可可中的错误...

这是我修剪原始电影并将修剪后的电影保存到不同文件的代码片段：

QTMovie *newmovie;
NSError *error = nil;

newmovie = [[QTMovie alloc] initToWritableData:[NSMutableData data] error:&error];

[newmovie setAttribute:[NSNumber numberWithBool:YES] forKey:QTMovieEditableAttribute];

QTTime starttime = QTMakeTimeWithTimeInterval(videostarttime);
QTTime duration = QTMakeTimeWithTimeInterval(currentclipduration);


QTTimeRange range = QTMakeTimeRange(starttime, duration);
[newmovie insertSegmentOfMovie:mvmovie timeRange:range atTime:QTZeroTime];


NSDictionary *dictionary = [NSDictionary 
                        dictionaryWithObjects:
                        [NSArray arrayWithObjects:
                         [NSNumber numberWithBool:YES],
                         [NSNumber numberWithBool:YES],
                         [NSNumber numberWithLong:kQTFileTypeMP4],  // TODO - allow to select the codec
                         nil]
                        forKeys:
                        [NSArray arrayWithObjects:
                         QTMovieFlatten, QTMovieExport, QTMovieExportType, nil]];




NSString *fileextn,*underscore,*combinedstring;

clipcount++;




NSString *intString = [NSString stringWithFormat:@"%d", clipcount];
fileextn = @".MP4 ";
underscore = @"_";
intString = [intString stringByAppendingString:fileextn];


combinedstring = [underscore stringByAppendingString:intString];

NSString* filename ;

filename = [curFileName stringValue].stringByDeletingPathExtension;

filename = [filename stringByAppendingString:combinedstring];

NSString *result = [[NSHomeDirectory() stringByAppendingPathComponent:@"Desktop"] stringByAppendingPathComponent:filename];



[newmovie writeToFile:result withAttributes:dictionary];

[newmovie release];

谁能帮我解决这个问题？....我不知道我做错了什么...除了“保存的 QTMovie 文件的预览帧图像都按预期工作...

谢谢和问候， 穆图

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