MediaCapture VideoDeviceController properties capabilities randomly supported

Question

On MediaCapture initialization I try to set some properties (Contrast, Zoom, Brightness), but only if supported by the host device.

var _captureMgr = new MediaCapture();
            await _captureMgr.InitializeAsync(new MediaCaptureInitializationSettings{
                    VideoDeviceId = devices[currentDevice].Id,                    
                });

            await _captureMgr.StartPreviewAsync();  

if (_captureMgr.VideoDeviceController.Brightness.Capabilities.Supported)
            {
                brightnessSlider.Minimum = _captureMgr.VideoDeviceController.Brightness.Capabilities.Min;
                brightnessSlider.Maximum = _captureMgr.VideoDeviceController.Brightness.Capabilities.Max;
                brightnessSlider.StepFrequency = _captureMgr.VideoDeviceController.Brightness.Capabilities.Step;
                brightnessSlider.Value = (brightnessSlider.Minimum + brightnessSlider.Maximum) / 2;
            }

At first time the Brightness Slider is currently initilized, in fact _captureMgr.VideoDeviceController.Brightness.Capabilities.Supported is true.

At second time (after _captureManager.Dispose()) the App executes the same code, but _captureMgr.VideoDeviceController.Brightness.Capabilities.Supported is false.

This sounds weird considering the fact that while debugging if I pause before the check, the second try works too. It seems to be some delay between check and real reinitialization, but a Task.Delay(millis) doesn't work.

Is there some issue in my async/await logic?

MediaCapture VideoDeviceController properties capabilities randomly supported

0 Answers0