DirectX 9 AudioVideoPlayback Error

I've Tried to load video using AudioVideoPlayback.
It works well until I set Volume or Balance.
It doesn't show any error but the ending event is not raised for unknown reason.
When I don't set Volume or balance, this event is raised normaly.

If any one knows about this bug...

Code:

---

Private Sub ClipEnd(ByVal sender As Object, ByVal e As EventArgs) Handles ourAudio.Ending, ourVideo.Ending
        'Stop and restart our clip when it ends
        If Not (ourVideo Is Nothing) Then
            ourVideo.Stop()
            'myForm.EventPlayer(PLAYER_EVENTS.PLAYER_EOF, "", "")
        Else
            If Not (ourAudio Is Nothing) Then
            ourAudio.Stop()
            'myForm.EventPlayer(PLAYER_EVENTS.PLAYER_EOF, "", "")
            End If
        End If
End Sub

Public Function SetPlayBackVolume(ByVal volume As Integer) As Boolean Implements Player.SetPlayBackVolume
        lngVolume = volume '0 to 255
        'DX Volume -10000 to 0
        If Not (ourVideo Is Nothing) Then
            'ourVideo.Audio.Volume = (volume - 255) * 39
        Else
            If Not (ourAudio Is Nothing) Then
                ' ourAudio.Volume = (volume - 255) * 39
            End If
        End If
End Function

Public Function SetPlayBackBalance(ByVal Balance As Integer) As Boolean Implements Player.SetPlayBackBalance
        lngBalance = Balance '0 to 255
        'DX Balanc -10000 to 10000
        If Not (ourVideo Is Nothing) Then
            'ourVideo.Audio.Balance = (Balance - 128) * 78
        Else
            If Not (ourAudio Is Nothing) Then
                'ourAudio.Balance = (Balance - 128) * 78
            End If
        End If

    End Function

---

The event is not raised only when I set volume or Balance for Video Content. It works with Audio Content only.
It's not really when I set Them. In facts writting :

sub set volume(volume)
ourVideo.Audio.volume=volume
end sub

unable the event to be raised.

Another Problem :
When I play a mp3 file, I first read the id3v2 tag and then, i initialize the Audio object.
I played sevral mp3s without any problems.
But when i tried to play a song already played before, I've got an IO error which says the file is already used even though i have disposed the player which was playing it before.

I have to stop the whole program and run it again to play this song again.


Sorry if it's not very clear, my english is so bad.

There is a DirectX form here:
http://www.vbforums.com/forumdisplay.php?s=&forumid=2

Sorry, I didn't said i was using Managed DirectX9 for .net

I'm posting the subject here because :

1st Using .NET and most of the posts for DirectX9 are in the .NET forums

2nd Game and Graphics shouldn't use AudioVideoPlayback Dll from DX9 which has been made for media players

But thank you to remind me there's this forum, if i want to do some graphics.