iPhone - 收到内存警告

我从视频资源的使用aVFoundation框架阅读CMSampleBufferRef，在一个while循环，我收到那些图像象下面这样：当while循环执行它iPhone - 收到内存警告

-(void)splitImagesFromVideo 
{ 
    if (images != nil) { 
     [images release]; 
     images = nil; 
    } 
    images =[[NSMutableArray alloc] init]; 


    NSURL *fileURL = [[NSBundle mainBundle] 
         URLForResource:@"3idiots" withExtension:@"mov"]; 

    NSLog(@"video: %@",videoURL); 

    AVAsset *theAVAsset = [[AVURLAsset alloc] initWithURL:videoURL options:nil]; 

    NSError *error = nil; 
    float width = theAVAsset.naturalSize.width; 
    float height = theAVAsset.naturalSize.height; 
    AVAssetReader *mAssetReader = [[AVAssetReader alloc] initWithAsset:theAVAsset error:&error]; 



    NSArray *videoTracks = [theAVAsset tracksWithMediaType:AVMediaTypeVideo]; 
    AVAssetTrack *videoTrack = [videoTracks objectAtIndex:0]; 


    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA] forKey:(id)kCVPixelBufferPixelFormatTypeKey]; 
    AVAssetReaderTrackOutput* mAssetReaderOutput = [[AVAssetReaderTrackOutput alloc] initWithTrack:videoTrack outputSettings:options]; 

    [mAssetReader addOutput:mAssetReaderOutput]; 



    BOOL success = [mAssetReader startReading]; 
    NSInteger val = 1; 

    while ([mAssetReader status]==AVAssetReaderStatusReading){ 
     CMSampleBufferRef buffer = [mAssetReaderOutput copyNextSampleBuffer];//read next image. 
     if (buffer) { 

      UIImage *img = [self imageFromSampleBuffer:buffer]; 
      if (img != nil) { 

       NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
       img = [self imageOfSize:CGSizeMake(320, 480) fromImage:img]; 
       [images addObject:img]; 
       [pool release]; 
      } 

      CMSampleBufferInvalidate(buffer); 
      CFRelease(buffer); 
      buffer = nil; 

     } 
     NSLog(@"value: %d", val++); 
    } 

    [images removeLastObject]; 
    NSLog(@"img count: %d", [images count]); 
    NSLog(@"imgs: %@",images); 

    [theAVAsset release]; 
    [mAssetReader release]; 
    [mAssetReaderOutput release]; 
    NSLog(@"count: %d", [images count]); 
}

打印我把日志递增整数val。，并且在这段时间之间在GDB中显示消息“接收到的内存警告”。

非常感谢......

来源

2012-07-25 Shanmugaraja G

你怎么到内存警告作出反应？你的问题到底是什么？你在调查潜在的内存泄漏吗？如果是这样，你是否尝试过分析仪工具？ – 2012-07-25 07:09:50

您没有显示足够的代码。例如，什么是'[self imageFromSampleBuffer：]'？我们不知道，那么我们怎么知道你在记忆中可能用这种方法做什么？没有理由认为问题出现在你刚才在这里展示的片段中。 – matt 2012-09-07 21:11:58

听起来像是你需要考虑你的包裹，而每次循环中自动释放池https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmAutoreleasePools.html

来源

2012-09-07 21:04:27 insomniac2846

只是内将您的

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

线while（）循环，并且放一个

[pool drain];

就在此之前while循环的结尾。

此外，这取决于你有多少图像有，你会耗尽内存，因为你保持你的内存缩小图像...

来源

2012-12-20 20:42:12

iPhone - 收到内存警告

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