opening jpg image after saving from ffmpeg not working

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C#

ASP.NET

ffmpeg

In my project I am saving videos, converting formats to .swf using ffmpeg. Converting and saving the videos is working fine, but I have a problem with creating the thumbnails. It saves a "picture.jpg" but there is no image. looking at the thumbnail its only got the normal photoviewer sign which is fine, but when I try to open the image it gives a message of
Windows photo viewer: Windows photo viewer cant open this picture because the file appears to be damaged, corrupted, or is too large. (this image is 2.7MB) - Photos taken from my camera is about 5MB and that opens.

PictureViewer: couldn't display "image.jpg" because a suitable graphics importer could not be found.

Paint: Paint cannot read this file. This is not a valid bitmap file or its format is currently not supported.
The images won't open in any I done to save the image:

tring thumbpath, thumbname;
                string thumbargs;
                string thumbre;
                thumbpath = Server.MapPath("~\\uploads\\" + dtYear + "\\" + dtMonth + "\\Thumb\\");

                CreateDirectoryIfNotExists(thumbpath);

                // Create the path and file name to check for duplicates.
                pathToCheck = thumbpath;

                // Create a temporary file name to use for checking duplicates.
                tempfileName = "";

                // Check to see if a file already exists with the
                // same name as the file to upload.        
                if (System.IO.File.Exists(pathToCheck))
                {
                    int counter = 2;
                    while (System.IO.File.Exists(pathToCheck))
                    {
                        // if a file with this name already exists,
                        // prefix the filename with a number.
                        tempfileName = thumbpath + counter.ToString() + withoutext + ".jpg";
                        pathToCheck = tempfileName;
                        counter++;
                    }

                    outputfile = tempfileName;
                    // Notify the user that the file name was changed.
                    lblMsg.Text = "A file with the same name already exists." +
                        "<br />Your file was saved as " + counter.ToString() + withoutext + ".jpg";
                }

                thumbname = thumbpath + withoutext + "%d" + ".jpg";
                Session["thumbname"] = withoutext + "1" + ".jpg";
               // thumbargs = "-i {0} -f image2 frame-%1d.png -y {1};
                thumbargs = "-i " + inputfile + "-f image2 -ss 1.000 -vframes 1 " + thumbName;
                Process thumbproc = new Process();
                thumbproc = new Process();
                thumbproc.StartInfo.FileName = spath + "\\ffmpeg\\ffmpeg.exe";
                thumbproc.StartInfo.Arguments = thumbargs;
                thumbproc.StartInfo.UseShellExecute = false;
                thumbproc.StartInfo.CreateNoWindow = false;
                thumbproc.StartInfo.RedirectStandardOutput = false;
                try
                {
                    thumbproc.Start();
                    fuPath.PostedFile.SaveAs(thumbname);
                }
                catch (Exception ex)
                {
                    Response.Write(ex.Message);
                }
                thumbproc.WaitForExit();
                thumbproc.Close();

EDIT:
I've tried these arguments as well, still can't get the image to work...
It saves, just can't open it...

//thumbargs = "-i " + inputfile + " -an -ss 00:00:03 -s 120×90 -vframes 1 -f mjpeg " + thumbName;
               // thumbargs = "-i " + inputfile + "-f image2 -ss 1.000 -vframes 1 " + thumbName;
                thumbargs = "-i " + inputfile + " -vframes 1 -ss 00:00:10 -s 150x150 " + thumbName;

                //  thumbargs = "ffmpeg -i" + inputfile + " -ss 0:00:01.000 -sameq -vframes 1 " + withoutext + ".jpg";
                //  thumbargs = "-i " + inputfile + " -vframes 1 -ss 00:00:07 -s 150x150 " + thumbName;

EDIT:

I tried adding the argument to the command prompt to see if it works there but it gave me a message of : [NULL @ 000000000025f7a0] Unable to find a suitable output format for 'vframes' vframes: invalid argument The line I used:

<pre lang="c#">>
ffmpeg -i VID2012.3GP vframes 1 VID2012.jpg

EDIT:
I changed a bit of my code. Debugging through my code there is no exception that is thrown, but if I point the mouse over the process (after it started) it "shows an exception of type System.InvalidOperationException"

thumbargs = "-i " + postedfilename + " vframes 1" + thumbName;
                ProcessStartInfo thumbProcstartIfo = new ProcessStartInfo();
                thumbProcstartIfo.FileName = @"\ffmpeg\ffmpeg.exe";
                thumbProcstartIfo.Arguments = thumbargs;
                thumbProcstartIfo.UseShellExecute = false;
                thumbProcstartIfo.CreateNoWindow = true;
                thumbProcstartIfo.RedirectStandardOutput = false;

                try
                {
                    using (var process = new Process())
                    {
                        process.StartInfo = thumbProcstartIfo;
                        process.Start();
                        process.WaitForExit();
                    }
                }
                catch (InvalidOperationException ex)
                {
                    lblMsg.Text = ex.ToString();
                }