Yo everyone.
Its been a while since I posted here as i've moved away from VB for the last few months. Anyway, seen as the support is so good here, I was wondering if anybody here could help me with a small issue i'm having with ripping MP3 files out of a MP4 video using ffmpeg.

Here's my code so far, but for some reason it doesn't want to work for me
Code:
Imports System.IO

Public Class Form1
    Dim process As New Process



    Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork

        With process.StartInfo
            .FileName = "ffmpeg.exe"
            .Arguments = "ffmpeg.exe -i " & CurDir() & "/test.mp4" & " -ab 128k " & CurDir() & "/test.mp3"
            ' Must be set to false in order to redirect output
            .UseShellExecute = False
            ' ffmpeg uses StandardError instead of StandardOutput
            .RedirectStandardError = True
            ' Uncomment this when code is working to hide the DOS window
            '.CreateNoWindow = True
        End With
        process.Start()
        Dim outputReader As StreamReader = process.StandardError
        Dim output As String

        While Not process.HasExited
            output = outputReader.ReadLine()
            BackgroundWorker1.ReportProgress(0, output)
            Threading.Thread.Sleep(500)
        End While

    End Sub


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' Enable the ability to stop ffmpeg
        BackgroundWorker1.WorkerSupportsCancellation = True
        ' Lets you get ffmpeg output info
        BackgroundWorker1.WorkerReportsProgress = True
        ' Start the background worker. This method prevents form from locking
        BackgroundWorker1.RunWorkerAsync()
    End Sub

    Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
        ' Show the output in a RichTextbox
        Dim output As String = e.UserState.ToString
        RichTextBox1.Text &= output & Environment.NewLine
        RichTextBox1.SelectionStart = RichTextBox1.Text.Length

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        'cancel
        process.Kill()
    End Sub

    
End Class
If I open up a command prompt and type:

Code:
ffmpeg.exe -i  test.mp4 -ab 128k test.mp3
The conversion works fine.

Quite confused with this one, and spent hours trying to get it to work.
Any help would be greatly appreciated.
If anyone would like me to upload the whole project, including "ffmpeg.exe", i'll gladly do that (The upload will be about 30mb though).
Thanks all