converting block of jpg to wmv using window media encoder

Hi
I try to convert jpg to wmv using window media encoder
I running this code (contain single jpg for Trial) I get error
"System.Runtime.InteropServices.COMException (0xC00D0BB8): The input media format is invalid."
at line: SrcVid.SetInput(@"C:\Users\jacoba\Videos\Untitled.jpg", "", "");
any idea how to SetInput for jpg (or any others image - BMP, PNG etc.)

1. try
2.            {
3.                //get current folder
4.                string curentFolder =Directory.GetCurrentDirectory();
6.                // Create a WMEncoder object.
7.                WMEncoderEncoder=newWMEncoder();
9.                // Retrieve the source group collection.
10.                IWMEncSourceGroupCollectionSrcGrpColl=Encoder.SourceGroupCollection;
12.                // Add a source group to the collection.
13.                IWMEncSourceGroupSrcGrp=SrcGrpColl.Add("SG_1");
16.                IWMEncVideoSource2SrcVid=(IWMEncVideoSource2)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);
17.                SrcVid.SetInput(@"C:\Users\jacoba\Videos\Untitled.jpg","","");//Bitmap file (.bmp, .gif or .jpg file)
21.                // Crop 2 pixels from each edge of the video image.
22.                SrcVid.CroppingBottomMargin=2;
23.                SrcVid.CroppingTopMargin=2;
24.                SrcVid.CroppingLeftMargin=2;
25.                SrcVid.CroppingRightMargin=2;
27.                // Specify a file object in which to save encoded content.
28.                IWMEncFileFile=Encoder.File;
29.                File.LocalFileName= curentFolder+@"\OutputFile.wmv";
31.                // Choose a profile from the collection.
32.                IWMEncProfileCollectionProColl=Encoder.ProfileCollection;
33.                IWMEncProfilePro;
34.                for(int i =0; i <ProColl.Count; i++)
35.                {
36.                    Pro=ProColl.Item(i);
37.                    //Console.WriteLine(Pro.Name.ToString());
38.                    if(Pro.Name=="Windows Media Video 8 for Broadband (PAL, 700 Kbps)") //"Screen Video/Audio High (CBR)"
39.                    {
40.                        SrcGrp.set_Profile(Pro);
41.                        break;
42.                    }
43.                }
45.                // Fill in the description object members.
46.                IWMEncDisplayInfoDescr=Encoder.DisplayInfo;
47.                Descr.Author="Author name";
48.                Descr.Copyright="Copyright information";
49.                Descr.Description="Text description of encoded content";
50.                Descr.Rating="Rating information";
51.                Descr.Title="Title of encoded content";
53.               Encoder.PrepareToEncode(true);
54.                Encoder.Start();
55.                Console.WriteLine("Press Enter when the file has been encoded.");
56.                Console.ReadLine();// Press Enter after the file has been encoded.
57.            }
58.            catch(Exception e)
59.            {
60.                Console.WriteLine(e.ToString());
61.                Console.ReadLine();
62.            }