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I haven't used the module, but the bandwidth question depends on how the particular module gets and uses the information.
If the module is framing content from an external source or app, then no. If it is pulling the information from the cam/app and displaying it, is that function called when the page displays or constantly. Same goes for having the info fed to it from the web cam or app.
The best way to find out dean, would be to check your logs from the server.
Look for:
a) whether or not you have constant access/pings from the ip of the webcam.
b) check page access information to see if any part of the module is transfered in part or in whole when comparing it to the ip access information.
c) Start your cam, log inot the site and watch for a specified amount of time, taking note of what time and day you are doing this, and then check the info in your web logs to see if that created a significant increase in bandwidth use during the test compared to no test.
This will also provide you with some decent 'standards' to use for calculating what your bandwidth requirements are going to be over time based on the number of users or expected users viewing the cam, and for an average length of viewing time or specific file size.
Maybe I'll buy a new firewire cable for my camcorder this weekend and try it out