Improve FLV to MP3 PHP and AJAX script (script 95% done and working)

The task is to improve a script that converts flv files to mp3 files and make it more user friendly. I have the core php script done and working and will be given to the bidder. The script relies on php curl to get the flv from youtube and then used ffmpeg to convert to a downloadable mp3 file. The coder must be fluent in php, javascript, and ajax. There is not much to do as the script already working and downloads and converts the video to mp3 and deletes the video when done. Required: Make my script function like this site listentoyoutube (dot) com, [login to view URL] 1) the script must show the video name and picture before downloading (already built-in but not working if curl is enabled but does work if disabled) 2) there needs to be a loading status bar showing the progress of the video downloaded, with percent and speed. 3) make any necessary improvements to the curl code to make it more efficient and supress stack overflow and other apache errors. 4) have simple input validation and a session to avoid duplicate downloads 5)the script already deletes the video, but also must delete mp3 after a successful download. 6)preview the mp3 option like listentoyoutube. 7)must work on Windows XAMPP (the latest version from apache friends) *Bonus not required 8) add a multiserver option