configurable bitrate and framerate

cap bitrate to 2mbit/s
cap framerate to 30 fps

Change-Id: Iad604dac450b250e1d5f28e1116a6256a5903b14
allow to turn audio recording off

Change-Id: I26284c19f1cba9314c50d3f946b77206c254e6e7
version: 1.0.1

Change-Id: If8ba6a393f5f6b75ad5a9610fd2979fac9ecbf3a