如何设置iPhone视频输出图像大小

这就是我们如何获得较低分辨率的输出,以便在操作图像时获得较高的FPS:

//  sessionPreset governs the quality of the capture. we don't need high-resolution images,
//  so we'll set the session preset to low quality. 
self.captureSession.sessionPreset = AVCaptureSessionPresetLow;

阿萨夫平哈西。