Metro ap how to achieve MediaCapture resolution change lead to preview size change

Question

Hi ,

http://code.msdn.microsoft.com/windowsapps/CameraCaptureUI-Sample-845a53ac

this sample using CameraCaptureUI create a camera Metro ap,the Resolution change can lead to preview size change.I need to use MediaCapture create a camera Metro ap,but I can not achieve the Resolution change lead to preview size change.

Can anyone help to answer this question?

Answer 1

Hello,

Unfortunately I don’t fully understand your question. Are you trying to get an event from the MediaCapture object when a dynamic format change occurs? I’m not sure that we have fully tested dynamic format change from a USB camera source. Theoretically this should work. Can you please give me more detail about what you are trying to do and I will do what I can to help.

James,

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

Answer 2

Hi James,

USB camera support some diff resolution,eg:1920x1080 1280x720 640x480.w/h=16/9 or 4/3,I want different w/h,the preview size can change with it.

Answer 3

So from what I understand you are expecting the preview “window” height and width to change automatically when you set the resolution of the camera. I expect that you will need to do this in your code. I don’t expect that the preview window itself will change its resolution. I expect the rich compositor to automatically scale the video to fit in the predefined “window” size. To make this change happen you will have to change the size of the preview “window” yourself.

I hope this helps,

James

Answer 4

Thanks for your help.

Answer 5

Dears,

When you use MediaCapture to create a camera Metro ap,

Do you know how to change the Resolution? 

(Please provide me the source code.. Thanks!!!)

 

Answer 6

Hi all, does anyone know how to change the resolution of mediaCapture?

The photos I take with my aplication comes with lower resolution then the ones I take with the camera app that comes with windows (wich I can set to a greater resolution).

Thanks in advance!

Answer 7

Hi, i just found the solution.

The code bellow provides information about the resolution of camera. It gets the greater resolution available in YUY2 format. You can see on output windows the available resolutions.

private MediaCapture mediaCapture_;
bool DEBUG_ = true;
...
this.mediaCapture_ = new MediaCapture();
await this.mediaCapture_.InitializeAsync();
...

public async Task SetResolution()
        {
            System.Collections.Generic.IReadOnlyList<IMediaEncodingProperties> res;
            res = this.mediaCapture_.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
            uint maxResolution = 0;
            int indexMaxResolution = 0;
            string s = "";

            if (res.Count >= 1)
            {
                for (int i = 0; i < res.Count; i++)
                {
                    VideoEncodingProperties vp = (VideoEncodingProperties)res[i];
                    var frameRate = (vp.FrameRate.Numerator / vp.FrameRate.Denominator);
                    

                    s = i + ") " + vp.Subtype + ", ";
                    s = s + vp.Width;
                    s = s + " x " + vp.Height;
                    s = s + " , Frame/s: " + frameRate;
                    
                    if (vp.Width > maxResolution && vp.Subtype.Equals("YUY2"))
                    {
                        indexMaxResolution = i;
                        maxResolution = vp.Width;

                    }
                    if (DEBUG_)
                    {
                        Debug.WriteLine(s);
                    }
                    s = "";
                }

                //setting resolution
                await mediaCapture_.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, res[maxResolution]);


            }
        }

Answer 8

Thanks for your help.

　　　你好，我现在也想用MediaCapture拍摄，问题和你一样，也是没法调宽高比，不知道这个问题你解决了没呢。。。

　　　Hi,now I want to use MediaCapture ,the same problem come to me ,i can't reset the video's hight or width , i guess u have sovled the question ,can you help me?