hi
Ok i know you solved it , but I have to add some thing so this might help others having this problem , which made my Droidcam not having sound and brought me to madness so i finally solved it by watching a video that had nothing to do with Droicam .
So what was happening is that somehow the privacy options from the Windows Microphone settings got turned off this allows other programs such as Droidcam to get acess to the microphone .
All I had to do is to turn it on again .
'''Start menu -> Settings -> privacy -> Microphone - > click on the “Change button “ and turn it back to “on”'''
Took me something like a month to get this so i hope this help to some that are getting Insane like i was !!