we offer higher education courses online. but in our country most of users have dial up internet. we need to transmit video and audio continusly. so what your suggestion for fast and userfriendly and low-cost online classroom?
migrated from stackoverflow.com Jul 23 '10 at 2:45
This question came from our site for professional and enthusiast programmers.
closed as off topic by random♦ Jul 23 '10 at 5:54
Questions on Super User are expected to relate to computer software or computer hardware within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.
You simply won't be able to transmit continuous video and audio on dial-up.
That said, Moodle is decent, and free. I'm not sure if does live classroom stuff.
All popular video and audio formats (MPEG, MP3, ...) are pretty efficiently compressed already, so you can't really bring the filesize down without degrading quality. With a 56K modem, you can expect 5KB/s tops -- with no noise on the line or other interference, which in my experience has been unlikely. Back in the day when I used dialup, I would get around 3KB/s downstream.
You cannot stream audio or video over this connection; it must be downloaded and waited for. An mp3 at 128Kbps (=16KB/s) will take 4 or 5 times as long to download as its content's length. (a 1 minute file will take about 5 minutes to download). If you must put this data through phone lines, why not just use a phone's built-in streaming capability (i.e. play a recording :-)