Flv文件下载和浏览器进度条

I have just coded up a web based flv file download utility. When I try to download an flv file, the browser does not show a progress bar as in I do not see the time left for download. Somewhere I read that this happens if the flv file you are trying to download does not have a meta tag associated with it. So I ran my flv file through the Perl module I have just coded up a web based flv file downl