http://www.videowhisper.com/?p=Video+Conference

VideoWhisper Video Conference is a modern multiple way video chat and
real time file sharing tool. It can be used stand alone or integrated
to existing sites. Using latest AS3 technology it provides better
speed and stability compared to similar older software. Data (rooms,
settings) and user interface (skins, icons, sounds) is loaded from
external files that can be edited or replaced allowing webmasters and
developers to easily customize the user experience. This software is
great for meetings, trainings, conferences, live events, recruiting,
consultations, coaching and of course casual community chat. This
brings people together instantly and without travel costs. These
benefits open a wide range of new business opportunities and bring the
extra value needed by established sites struggling to go ahead of
their competitors. The software requires FMS.
http://www.videowhisper.com/?p=Video+Conference

Video Conference User Features
* Interface panels can be moved and resized by user
* Multiple video / chat panels
* Popup chat panels like on instant messenger applications
* Emoticons (loaded from external image files based on a custom
xml list)
* Hardware detection and user selection
* Enable/disable sounds
* Mute audio
* Custom bandwidth and quality settings for client
* File Sharing (upload/delete files)
* Private Chats in popups as on Instant Messenger Applications
* Create / Delete Rooms from chat interface

Video Conference System Features
* Unlimited rooms/user lists
* Block/Unblock
* Private Instant Messages
* Ghost connection detection
* Room counters
* Microphone/Webcam status
* Bandwidth Detection

http://www.videowhisper.com/?p=Video+Conference

For all editions graphics and sounds are loaded from external png &
mp3 files. Source code for all php files is provided.

Multiple editions are available including PHP only for easy
integration on any website, joomla component.