Runtime error about addEffectAsync when preivew capture?

Question

Dear Sir,

  I tried to use addEffectAsync to add built in video stabilization at webcam preview, but I got runtime error at JavaScript, which said "A method was called at an unexpected time." 

The following is my code snip. Is the calling sequence correct?  Thanks.

 

 

    var video_tag = document.getElementById("video_capture");

    m_media_capture = new Windows.Media.Capture.MediaCapture();

    m_media_capture.initializeAsync().then(function () {

 

        m_media_capture.addEffectAsync(Windows.Media.Capture.MediaStreamType.videoPreview,

            "Windows.Media.VideoEffects.VideoStabilization", null).then(function () {

            video_tag.src = URL.createObjectURL(m_media_capture, false);

            video_tag.play();

        }, errorHandler);

    }, errorHandler);

 

Chik

 

Answer 1

Hello Chik,

Please take a look at this sample code. If you still have questions after reviewing this documentation please let me know and I will do what I can to help.

How to add video stabilization

http://msdn.microsoft.com/en-us/library/windows/apps/hh465140.aspx

Thanks,

James

Windows Media SDK Technologies
Microsoft Developer Services
http://blogs.msdn.com/mediasdkstuff/

Answer 2

Hi James,

The sample code looks so simple but I just cannot find the correct calling sequence about "initializeAsync", "addEffectAsync", and "start preview on HTML video tag."

In my code snip, the effect has been added, but the runtime error appears when the debug mode is "Script Only". Do I miss something? 

Thanks for your reply.

Chik

 

Answer 3

Chik,

 

Sorry for the late reply. Are you still having problems with this API? If so please let me know and I will make sure we get you some help.

-James

---

James Windows Media SDK Technologies Microsoft Developer Services http://blogs.msdn.com/mediasdkstuff/

Answer 4

Hi James,

  Thanks for your reply. I change to add effect during the video of preview is playing, and the error disappeared. Thanks.

 

Chik