[Banshee-List] TranscoderService Enqueue always throws exception

[Chandra Kirchrath <kirchrath googlemail com>]

Hello,
I want to transcode tracks to pcm/wav. So I wrote this code fragment:

        private void convert2wav(Banshee.Collection.Database.DatabaseTrackInfo track)

        {

            Banshee.MediaEngine.TranscoderService transcoder = new Banshee.MediaEngine.TranscoderService();

            Banshee.MediaProfiles.MediaProfileManager profilemanager = new Banshee.MediaProfiles.MediaProfileManager();

            Banshee.MediaProfiles.Profile profile = "">

            Banshee.MediaProfiles.ProfileConfiguration config = profile.Configuration;

            MMTranscoderHandler handleservice = new MMTranscoderHandler();

            try{

                Hyena.SafeUri outputUri = new Hyena.SafeUri ("/home/kirchrath/m.wav");

                transcoder.Enqueue(track, outputUri, config, handleservice.transcoded, handleservice.cancelled, handleservice.error);

            }

            catch(Exception e)

            {

                Hyena.Log.Exception(e);

            }

            Hyena.Log.Information("Fertig");

        }

I did not found a documentation, so I wrote this just by trying. The following exception is thrown:

[1 Warn  21:12:31.093] Caught an exception - System.NullReferenceException: Object reference not set to an instance of an object (in `Banshee.GStreamer')

  at Banshee.GStreamer.Transcoder.TranscodeTrack (Banshee.Collection.TrackInfo track, Hyena.SafeUri outputUri, Banshee.MediaProfiles.ProfileConfiguration config) [0x00000] in <filename unknown>:0 

  at Banshee.MediaEngine.TranscoderService.ProcessQueue () [0x00000] in <filename unknown>:0 

  at Banshee.MediaEngine.TranscoderService.Enqueue (Banshee.Collection.TrackInfo track, Hyena.SafeUri out_uri, Banshee.MediaProfiles.ProfileConfiguration config, Banshee.MediaEngine.TrackTranscodedHandler handler, Banshee.MediaEngine.TranscodeCancelledHandler cancelledHandler, Banshee.MediaEngine.TranscodeErrorHandler errorHandler) [0x00000] in <filename unknown>:0

I would be really happy if anybody could help me - even it is just a link to a documentation.

Thank you all

Chandra