AVAssetWriter东西泄漏

Question

喂，我在iOS开发的新手，我已经endountered一些问题

我喜欢的对象AVAssetWriter的一些设置（我用它来写pixelmaps 作为帧视频 - 和它的作品确定）

self.assetWriter = [[AVAssetWriter alloc] initWithURL:outputPath fileType:AVFileTypeQuickTimeMovie error:&error]; 

    NSMutableDictionary *dic=[[NSMutableDictionary alloc] init]; 
    [dic setValue: AVVideoCodecH264 forKey: AVVideoCodecKey]; 
    [dic setValue:[NSNumber numberWithInt:640] forKey:AVVideoWidthKey]; 
    [dic setValue:[NSNumber numberWithInt:480] forKey:AVVideoHeightKey]; 
    self.assetWriterInput = [[AVAssetWriterInput alloc] initWithMediaType:AVMediaTypeVideo outputSettings:dic]; 
     [dic release]; 

    assetWriterInputPixelBufferAdaptor =[[AVAssetWriterInputPixelBufferAdaptor alloc] initWithAssetWriterInput:assetWriterInput sourcePixelBufferAttributes:nil]; 

    self.assetWriterInput.expectsMediaDataInRealTime=YES; 
    [self.assetWriter addInput:assetWriterInput]; 

    [self.assetWriter startWriting]; 
    [self.assetWriter startSessionAtSourceTime:recordStartTime]; 

那么之后我保存的视频，然后后，我释放实例

[self.assetWriterInput markAsFinished]; 
[self.assetWriter endSessionAtSourceTime:recordStartTime]; 
[self.assetWriter finishWriting]; 

CVPixelBufferPoolRelease(assetWriterInputPixelBufferAdaptor.pixelBufferPool); 
[self.assetWriter release]; 
[self.assetWriterInput release]; 
[self.assetWriterInputPixelBufferAdaptor release]; 

麻烦的是，仪器告诉我，当泄漏我使用上面的对几次来创建和发布实例来保存一些视频

帮助！

Answer 1

AVAssetWriter *newWriter = [AVAssetWriter alloc] // retain count is 1. 
self.assetWriter = newWriter // What this actually does: 

- (void)setAssetWriter(AVAssetWriter*)newWriter 
{ 
    if (_assetWriter != newWriter) 
    { 
     [_assetWriter release] 
     _assetWriter = [newWriter retain]; //retain count 2 
    } 
} 

[self.assetWriter release]; //retain count 1 

如果您忘记添加self.assetWriter = nil; dealloc，你最终会泄漏。当[Alloc] ating实例并通过@properties分配它们时，附加autorelease以分配这样的行：

self.assetWriter = [[[AVAssetWriter alloc] initWithURL:outputPath fileType:AVFileTypeQuickTimeMovie error:&error] autorelease];