Converting MP4 to MP3 itunes song length doubled

[jimbrown-net]

when converting MP4 to MP3 itunes song length doubled but windows properties are correct. is this a bitrate issue? thoughts?

       `Dim inputFile = New MediaFile(tbOutputFolder.Text + VideoMP4)
        Dim outputFile = New MediaFile(tbOutputFolder.Text + AudioMP3)

        Using engine = New MediaToolkit.Engine()
            engine.Convert(inputFile, outputFile)
        End Using` 

[AydinAdn]

I just want to point out, this library may not be CLS compliant and one of the parameters that you're using may be being meddled with because of it, though I can't be sure. If anyone else has any ideas, would love to hear them