1. A method of collection of quality statistics, wherein the method comprises the following steps, implemented by a quality statistics collecting device, referred to as first device: reception of a collection mode signal comprising an information representative of a mode of collection of quality statistics, so-called requested mode, said requested mode having at least two possible values comprising a first mode and a second mode; if the requested mode is the first mode, entering in the first mode; if the requested mode is the second mode, entering in the second mode; in the first mode, connection to a test stream upon reception of a request for connection signal comprising a request for connection to said test stream; in the second mode, automatic connection to a test stream whenever resources of said first device needed for said collection of quality statistics are available; collection of quality statistics when said collection of quality statistics has been enabled by reception of a quality statistics collection enable signal enabling said collection of quality statistics and when said first device is connected to a stream.