Convert uploaded video into flv on the fly

I need to automate the conversion of uploaded videos from various formats (quicktime, swf, mpg, etc) into FLV (Flash Video). This process needs to be automatic and an email needs to be generated once the conversion is successful or failed. The code needs to be done asp.net(vb.net) framework 3.5 ONLY. No c# please, no PHP Please, no Java, no rubby, no cold fusion, no drupal. The files are uploaded via fileupload([login to view URL]) component. So the conversion needs to take place using that component and saving the original raw file into a temporary directory. Conversion takes place and the new (FLV) file is moved to another directory. The original raw file is deleted.