AVAssetWriter東西泄漏

Question

喂，我在iOS開發的新手，我已經endountered一些問題

我喜歡的對象AVAssetWriter的一些設置（我用它來寫pixelmaps 作爲幀視頻 - 和它的作品確定）

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]; 

那麼之後我保存的視頻，然後後，我釋放實例

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

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

麻煩的是，儀器告訴我，當泄漏我使用上面的對幾次來創建和發佈實例來保存一些視頻

幫助！

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 

如果您忘記添加self.assetWriter = nil; dealloc，你最終會泄漏。當[Alloc] ating實例並通過@properties分配它們時，附加autorelease以分配這樣的行：

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