Windows 8桌面应用程序的视频捕获（HTML + javascript）。 不是来自网络摄像头

Question

I´m developing a Windows 8.1 App for desktop using HTML and Javascript. I have a video grabber card and i would like to view the video being captured in real-time at my App. Searching the internet i´ve found some examples and tutorial of capturing video for a Windows 8 App, but all of them are with the webcam, and i would like to know if that should be applicable to any "capture device" like my capture card.

I´ve followed this MSDN tutorial with no success.

http://msdn.microsoft.com/en-us/library/windows/apps/hh452791.aspx

EDIT (adding some more info):

If you follow the tutorial, the detection of capture devices whith the code bellow is ok, it properly detects my capture card.

var deviceInfo = Windows.Devices.Enumeration.DeviceInformation;
    deviceInfo.findAllAsync(Windows.Devices.Enumeration.DeviceClass.videoCapture).then(function (devices) {

        // Add the devices to deviceList

        if (devices.length > 0) {

            for (var i = 0; i < devices.length; i++) {
                deviceList.push(devices[i]);              
            }

            initCaptureSettings();
            initMediaCapture();
            document.getElementById("message").innerHTML = "Initialization complete.";

        } else {
            document.getElementById("error").innerHTML("No video device is found ");
        }
    }, errorHandler);

But then, it throws an "Access denied" exception at the "oMediaCapture.initializeAsync(captureInitSettings)" at the following section of code:

// Create and initialze the MediaCapture object.
function initMediaCapture() {
    oMediaCapture = null;
    oMediaCapture = new Windows.Media.Capture.MediaCapture();
    oMediaCapture.initializeAsync(captureInitSettings).then (function (result) {
       createProfile();
    }, errorHandler);
}

I think this could be because of some kind of access permission to the capture device ¿?¿? Any help?

Thanks in advance!!

Answer 1

If you only care about the video and do not want to use the audio, just make sure that the settings passed to InitializeAsync() specifies StreamingCaptureMode correctly:

            mediaCapture = new MediaCapture();

            MediaCaptureInitializationSettings initSettings = new MediaCaptureInitializationSettings();
            initSettings.VideoDeviceId = Webcam.Id;
            initSettings.StreamingCaptureMode = StreamingCaptureMode.Video;  // <----

            await mediaCapture.InitializeAsync(initSettings);

Kudos to Slimacik.