I have a few questions about filming videos because I want to make a film. I noticed that when I make videos with my kinda crappy camera, even filming in an ostensibly quiet room, the video has some sound in it. Like a humming sound. Where could that be coming from? Electrical equipment? Or maybe the microphone in the camera is bad? I looked up a couple of example videos of cameras I want to buy, and I hear the same thing in their videos. But I don't know how their room sounds in person. If I have no electrical equipment on, the microphone is good, and the room is silent to my ears, should the sound on the video also be silent? I'd like to have a perfectly silent video except for the sounds I want, so I don't have to edit out anything, which would probably make things a lot harder. Thanks.