that's usually a server mime-type issue.
Interesting idea, except that one of the web servers this was tested on didn't even have FLV set as a mime-type, yet that worked OK.
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unless you are the admin for the server you're using, you may not be aware of what mime-types are correctly configured for the server.
in any case, give it a try and add the following to your .htaccess file:
AddType video/mp4 .f4v
My apologies, you were right! I was logged in as administrator on the test web server, but looking at the top level mime types for the whole of IIS rather than on the site level. Whilst the .flv mime-type was NOT set at the top level, it WAS set at the site level but .f4v was not. I set that and it worked fine. I had also thought it was not working on the client's live server I had uploaded it to simply because it took a long time to appear compared to the .flv version. All working now.
Thanks for your help.