decodebin2 Autoplug and decode to raw media @gstdecodebin2: the object which received the signal. @arg1: @Returns: @gstdecodebin2: the object which received the signal. @arg1: @arg2: @Returns: @gstdecodebin2: the object which received the signal. @arg1: @arg2: @gstdecodebin2: the object which received the signal. @arg1: @gstdecodebin2: the object which received the signal. @arg1: @arg2: