you can accomplish rtmp like bit rate streaming limitations if you know your bitrate your videos are encoded at and set the throttle/rate limit per connection based on that bit rate thats encoded. This isn't rocket science.
Now saying that. Wowza/Abobe FMS is hell on disk IO vs a progressive download.
Nginx/lighttpd can be ran on fast disks and atom servers..
Wowza/FMS requires a bit more processing power and memory and is better suited on a quad or dual quad with ample ram.
It really comes down to what "perks" you want to accomplish, any of the modules/bw check, swf tokens etc? then wowza/FMS is your way ot go. If you just don't care and want to be cheap? lighttpd/nginx works fine.
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