崩溃-iPhone XS中的AVCaptureSessionPresentMedium

Question

成功捕获图像并且应用程序崩溃后，我尝试捕获视频。

if (iSRecordVideo) {
        DLog(@"iSRecordVideo");
        //ADD AUDIO INPUT
        AVCaptureDevice *audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
        NSError *error = nil;
        AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&error];
        if (audioInput)
        {
            [[self captureSession] addInput:audioInput];
        }

        //ADD MOVIE FILE OUTPUT
        self.videoOutput = [[AVCaptureMovieFileOutput alloc] init];

        Float64 TotalSeconds = 20;          //Total seconds
        int32_t preferredTimeScale = 20;    //Frames per second
        self.maxDuration = CMTimeMakeWithSeconds(TotalSeconds, preferredTimeScale); //<<SET MAX DURATION
        self.videoOutput.maxRecordedDuration = self.maxDuration;
        self.videoOutput.minFreeDiskSpaceLimit = 1024 * 1024;//<<SET MIN FREE SPACE IN BYTES FOR RECORDING TO CONTINUE ON A VOLUME


        if (IS_IPHONE_X_S_MAX)
        {
            [self.captureSession setSessionPreset:AVCaptureSessionPresetMedium];
        }
        else
        {
            [[self captureSession] setSessionPreset:AVCaptureSessionPresetMedium];
        }


        if ([[self captureSession] canAddOutput:self.videoOutput])
            [[self captureSession] addOutput:self.videoOutput];

        //SET THE CONNECTION PROPERTIES (output properties)
        [self CameraSetOutputProperties:audioCaptureDevice];
    }

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Answer 1

文档说：

  

如果canSetSessionPreset（_ :)返回true，则可以仅设置   该预设。

你应该做

if([self.captureSession canSetSessionPreset: AVCaptureSessionPresetMedium]){
      //set the medium preset
}

会话预设的默认值为“高”。

也许对于XS max，除高预设外，不允许任何其他值。