boinxtv doesn’t recognize my Canon-camera. What can i do?
What model is you camera?
canon-legria HF G10
Unfortunately this camera isn’t capable of sending out a live video stream over USB. You have to use a 3rd party HDMI-in-hardware like the Matrox MXO line (http://www.boinx.com/boinxtv/equipment/matrox/ ) to get your camera signal form the HDMI-out port into the Mac.
Which one i need?
There is another problem: if i import a clip i get the movie, but without sound. what i have to do?
Thanks, i’ve found the solution
Do you mind me to ask you to post your solution here? Other users who have the same or a similar problem can learn from your findings. Thanks! 
of course, i changed the audio output options and then it works 