iphone - AVCaptureVideoDataOutput和设置kCVPixelBufferWidthKey和kCVPixelBufferHeightKey

我正在尝试通过设置AVCaptureVideoDataOutput和kCVPixelBufferWidthKey从kCVPixelBufferHeightKey捕获特定大小的帧。
问题是缓冲区的宽度和高度永远不变，它们总是回来 852x640

这是我的代码:

// Add the video frame output
    self.videoOutput = [[AVCaptureVideoDataOutput alloc] init];
    [videoOutput setAlwaysDiscardsLateVideoFrames:YES];
// Use RGB frames instead of YUV to ease color processing
[videoOutput setVideoSettings:[NSDictionary dictionaryWithObjectsAndKeys:
                               [NSNumber numberWithFloat:320.0], (id)kCVPixelBufferWidthKey,
                               [NSNumber numberWithFloat:320.0], (id)kCVPixelBufferHeightKey,
                               [NSNumber numberWithInt:kCVPixelFormatType_32BGRA],(id)kCVPixelBufferPixelFormatTypeKey,
                                                              nil]];
 [videoOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];

编辑:来自iOS的AVCaptureOutput.h:当前，唯一受支持的密钥是kCVPixelBufferPixelFormatTypeKey。

有谁知道设置输出缓冲区宽度/高度的工作方法？

最佳答案

从iOS AVCaptureOutput.h:Currently, the only supported key is kCVPixelBufferPixelFormatTypeKey.
总结一下。