B4J Question MP3 to wav conversion problem using Jave2 FFMPeg Library

#Region Project Attributes
    #MainFormWidth: 600
    #MainFormHeight: 600
#End Region
#AdditionalJar: jave/jave-core-3.3.1
#AdditionalJar: jave/jave-nativebin-win64-3.3.1
#AdditionalJar: jave/slf4j-api-2.0.0
#AdditionalJar: jave/slf4j-nop-2.0.0

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI
    Private Button1 As B4XView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
    
    Dim SourceFile As String = "D:\test.mp3"
    Dim TargetFile As String = "D:\test.wav"
        
    Dim AudioAttrs1 As AudioAttributes
    AudioAttrs1.Initialize
    AudioAttrs1.SetCodec("pcm_s16le")
    
    Dim MO1 As MultimediaObject
    MO1.Initialize
    MO1.Create(SourceFile,"")
    
    Dim EncAttrs1 As EncodingAttributes
    EncAttrs1.Initialize
    EncAttrs1.SetOutputFormat("wav")
    EncAttrs1.SetAudioAttributes(AudioAttrs1)
'       
    Dim Enc1 As Encoder
    Enc1.Initialize(Me,"Enc")
    Enc1.Encode3(MO1,TargetFile,"",EncAttrs1)
    
    Try
        Wait For Enc_Complete(EndedOK As Boolean, Error As String)
        Log("Encoding complete " & EndedOK)
        Log("error "& Error)
    Catch
        Log("Encoding failed " & LastException)
        
    End Try
End Sub

Private Sub Enc_Event(MethodName As String,Args() As Object)
    
    Select MethodName
        Case "message"
            Log("Message " & Args(0))
        Case "progress"
            Log("Progress " & Args(0))
        Case "sourceinfo"
            Log("Source Info " & Args(0))
    End Select
End Sub