how to save webcam video stream on ftp as avi

Here's a small peace of c# code that uploads to ftp from the link source below. You could use it to simply write to using the stream object. Hopefully the connection won't be disconnected before your done uploading. You could give it a try.

public void ftpfile(string ftpfilepath, string inputfilepath)
{
    string ftphost = "127.0.0.1";
    //here correct hostname or IP of the ftp server to be given

    string ftpfullpath = "ftp://" + ftphost + ftpfilepath;
    FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpfullpath);
    ftp.Credentials = new NetworkCredential("userid", "password");
    //userid and password for the ftp server to given

    ftp.KeepAlive = true;
    ftp.UseBinary = true;
    ftp.Method = WebRequestMethods.Ftp.UploadFile;
    FileStream fs = File.OpenRead(inputfilepath);
    byte[] buffer = new byte[fs.Length];
    fs.Read(buffer, 0, buffer.Length);
    fs.Close();
    Stream ftpstream = ftp.GetRequestStream();
    ftpstream.Write(buffer, 0, buffer.Length);
    ftpstream.Close();
}

http://www.logiclabz.com/c/ftp-file-upload-using-ftpwebrequest-in-net-c.aspx[^]

Good luck!