What is Windows.Media.IVideoFrameStatics? RRS feed

  • Question

  • Hello hello,

    I try to implement faceTacker into the hololens. For that I use Hololens Camera Stream, because MediaCapture use CaptureElement which from XAML. My problem is when I implement videoFrame for FaceTracker I have this error :

    System.InvalidCastException: Unable to cast object of type 'System.__ComObject' to type 'Windows.Media.IVideoFrameStatics'.
       at System.StubHelpers.StubHelpers.GetCOMIPFromRCW_WinRT(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget)
       at Windows.Media.VideoFrame.CreateWithSoftwareBitmap(SoftwareBitmap bitmap)
       at test02.OnFrameSampleAcquired(VideoCaptureSample sample)

    And when I write it on google, I have result about Windows Media Player, so I have no idea what is it and how to resolve it ...

    Here is my code :

     void OnFrameSampleAcquired(VideoCaptureSample sample)
            if (frameSample == null || frameSample.Length < sample.dataLength)
                frameSample = new byte[sample.dataLength];
            IBuffer ibuffer = null;
            if(frameSample != null)
                ibuffer = frameSample.AsBuffer();
                Debug.Log("frameSample null");
            SoftwareBitmap softwareBitmapFrameSample = new SoftwareBitmap(BitmapPixelFormat.Nv12, this._resolution.width, this._resolution.height);
            if(softwareBitmapFrameSample == null)
                Debug.Log("Failed to create SoftwareBitmap");
                Debug.Log("SoftwareBitmap success");
                Debug.Log("BEFORE VIDEOfRAME");
                VideoFrame videoFrameSample = VideoFrame.CreateWithSoftwareBitmap(softwareBitmapFrameSample);
            }catch(Exception ex){
            UnityEngine.WSA.Application.InvokeOnAppThread(() =>
    //                faces = await this.faceTracker.ProcessNextFrameAsync();
            }, false);*/

    Thanks for the help...

    • Edited by Keurkeur Sunday, April 14, 2019 11:02 PM
    Sunday, April 14, 2019 11:02 PM

All replies

  • Hi KeurKeur,

    Thank you for posting here.

    For your question is more related to HoloLens, you could post a new thread in HoloLens forum for suitable support.

    Best Regards,


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    Monday, April 15, 2019 6:49 AM
  • Hello hello,

    thank you for your answer. But I think (even if I posted like you said in hololens forum) the problem is not really related to the hololens. The error I posted comes from the line :

    VideoFrame videoFrameSample = VideoFrame.CreateWithSoftwareBitmap(softwareBitmapFrameSample);

    So ... I don't know ... :/

    Thank you !

    Monday, April 15, 2019 10:30 PM