Autoexposure cannot be set

[zBugi]

Summary of your issue

I tried to set the AutoExposure Propertie through _cam.SetCameraPropertie(OpenCvSharp.VideoCaptureProperties.AutoExposure, 0.25); (I tried multiple values but none worked for me :/) but when I call the _cam.GetCameraPropertie(OpenCvSharp.VideoCaptureProperties.AutoExposure); it allways responds with -1 and it results in still manuell mode. Through _cam.SetCameraPropertie(OpenCvSharp.VideoCaptureProperties.Settings,1); I can set the autoexposure the problem is I need to do it directly through code :/

Environment

Write your environment. Windows 10 using the Directshow API

What did you do when you faced the problem?

Example code:

   _cam.SetCameraPropertie(OpenCvSharp.VideoCaptureProperties.Exposure,-12);
  _cam.GetCameraPropertie(OpenCvSharp.VideoCaptureProperties.AutoExposure); // => -1
  _cam.SetCameraPropertie(OpenCvSharp.VideoCaptureProperties.AutoExposure,0.75);
  _cam.GetCameraPropertie(OpenCvSharp.VideoCaptureProperties.AutoExposure); // => -1
  _cam.SetCameraPropertie(OpenCvSharp.VideoCaptureProperties.AutoExposure,0.25);
  _cam.GetCameraPropertie(OpenCvSharp.VideoCaptureProperties.AutoExposure); // => -1
// no change in images even with sleep in between but when i do 
  _cam.SetCameraPropertie(OpenCvSharp.VideoCaptureProperties.Settings, 1);
// => Open a dialog from Directshow then tick AutoExposure => Effect in the images

[AvenSun]

It depends on your hardware and API Backend you're using, check your device driver firstly, If it does support that then try setting some other backend via code below var dnnCapture = new VideoCapture(camIndex,VideoCaptureAPIs.MSMF);

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