There was a thread a while back and I had mentioned this app. It didn't work anymore (at least not on my Sprint Note 2). I hadn't tried on my international, but I suspect it'd be the same result.
Just tried this one that you posted and same thing...doesn't work on the Note 2. Only solutions I've seen are rooting and changing the .ogg file or using an app like Silent Camera.
Funny thing is, I have another camera app on my phone which has a silent mode, but that still didn't silence the sound. Go figure.