So you use the camera module i posted?
unfortunately i don’t use this module, so i am maybe the wrong person to ask…
But i took a look at the webcam.js of the module and in line 46/47 the width and hight is defined.
Maybe u should play around with that…
https://github.com/alexyak/camera/blob/master/webcam.js
nano MagicMirror/modules/camera/webcam.js
also check the camera.js at line 62/63…
nano MagicMirror/modules/camera/camera.js
I don’t know if it would be necessary to set the resolution of the cam within raspbian… ?
To start the cam with a button u can even use the MMM-Buttons module. This should work, if i understand the camera-module correct ^^
{
		    module: 'MMM-Buttons',
		    config: {
			maxShortPressTime: 1000,
		        buttons: [
		            {
		                pin: 15,
		                name: "camera",
		                shortPress: {
		                    notification: "SHOW_CAMERA",
                                         }
		             },
                                longPress: {
                                notification: "HIDE_CAMERA",
                                         },
		             },
		         ]
		     }
		},