ADB command to toggle camera modes in android device

Question

I am trying to figure out what is the command to load the camera app in different modes like following:

1. Toggle between camera and video cam corder mode
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Answer 1

For KK:

adb shell am start -a android.media.action.STILL_IMAGE_CAMERA --ei android.intent.extras.CAMERA_FACING 1

Change the id 0 or 1 for front and back camera.