As we all know, we cannot disable the N9 camera sound in option directly due to some legal reasons of different countries.

Changing the profile to silent mode still doesn't work.

One way is to plug in an headphone, the sound will go to the headphone and people around will not notice it. But it is a bit too complicated.

Of course, you also can use some 3rd party apps that support mute mode, such as Camera Pro, but I still think the original camera app is good enough.

So I checked the 4 sounds related to the camera/video recording :

They are all wav format files with stereo output.
The shortest one lasts 0.131s and the longest one lasts 0.320s.

Then it become easy, you can use some acoustics editing software to create a blank wav format file and replace the original ones :


Tested and it works perfect.