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Broadband Genie introduces 22Mbps broadband
Super-fast broadband is now available from Broadband Genie ( http://www.broadbandgenie.
co.uk ), the comparison specialist which allows consumers to
compare broadband online. This latest offering is courtesy of UK
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How to add streaming video to your web site
If adding streaming audio to a web site is a black art, what
about video? Moving images are really the final step in the
evolution of the web. Streaming video completes the loop, giving
a communication tool that offers all the advantages of video
tape without the problems of distributing hundreds of cassettes.
So why has video taken so long to catch on? The answer is simple
- bandwidth. Reasonable quality video in an eight-centimetre
window needs broadband speeds if it is to work. In reality this
means between 200-400kbps (kilo bits per second).
That's 25-50 kilobytes of information for every second you wish
to stream, or 1.5 - 3Mbytes for every minute. As you can see,
the file sizes get very big very quickly. My evaluations have
shown that a stream rate of about 225kbps is required for
reasonable, watchable video in a small-ish window. That's five
times faster that a dial-up modem can deliver and about half the
speed of a typical broadband or office LAN (Local Area Network).
In comparison, you can stream reasonable quality audio at around
32kbps - low enough for even dial-up modems. In reality, things
are not so simple. The trick with streaming video and audio is
to pick a streaming rate that is SLOWER than your typical
connection speed. That way, the end user's PC buffers the
incoming signal so that you have something "in reserve" if the
connection falters a little.
If the connection doesn't play ball you run the risk of a buffer
overrun, which leads to that annoying stuttering and freezing
that you so often see on the net.
But before you all rush out to put the latest corporate video on
your intranet I suggest you speak to your techies first. While
most corporate intranets are more than capable of streaming a
file at 200-300kbps we have overlooked one problem.
What happens if 5,000 people all want to view it at once? Can
your server handle that many people? Can the infrastructure cope
with that much data? Will you stop other people from carrying on
their essential work if you take up that much bandwidth?
Assuming that your office network is robust enough to cope what
exactly can you stream and how? You can take any MPEG, WMV or
Quicktime movie and stream it over the web. You can even convert
DVD material into a suitable format and stream that too,
although the level of complexity goes up accordingly.
DVDs are actually very clever devices made up of a host of
different computer files. The trick if you wish to stream them
is to extract the video and audio files from the DVD using a
process called ripping.
Once extracted you can then convert the resultant .VOB files to
smaller, faster MPEG or WMV files. Unfortunately, there are a
lot of industry standards out there and one-size fits
all
approach is virtually doomed to failure.
PCs running MS Windows are generally happy receiving Window
Media Files (.WMV), whereas Macintosh users are going to be
happier with Quicktime movies. But if you host all your videos
as Quicktime, the chances are that Window users won't be able to
view them. MPEG files are great, but again, older versions of
Windows Media Player won't like them.
A solution is to offer users a choice of file formats on the
same page and let your users choose. Or, given that Macintosh
users are in the minority anyway, just ignore them and settle
for .WMV - I know it's harsh, but if they are really keen they
will download and install the Windows Media Player anyway.
Another solution involves using Macromedia Flash, the plug-in
for which can be found on more than 90-95% of all machines in
the world apparently. Flash is truly cross-platform, but your
end user must have the plug-in Installed otherwise all they will
see is a blank box.
The other advantage of using Flash is that you can build the
video player right into the page, complete with stop, play,
pause and rewind buttons.
Learning to stream video takes time. Get the stream rate wrong
and your videos will stutter like Norman Collier. Get the CODEC
wrong and half your users will hear the audio, but not see the
video. Rip your DVD incorrectly and you will have video and
audio that don't actually synch up.
Frequently Asked Questions
Q. What is streaming video? A. It is video delivered to your
computer that can be watched while it is still downloading.
Q. What do viewers need to have on their computer? A. A
soundcard and speaker(s) or headphones, their normal browser
software and a so-called plug-in - a small piece of software
that converts the data into sound. If you opt for .WMV streaming
they will also need the Windows Media Player.
Q. This all sounds expensive - is it? A. Not really. The
programs needed to convert video into a streaming format are
very reasonable. I recommend MSIVideo
(http://hop.clickbank.net/?snichols/msincome) Its great, very
easy to use and only costs $39.95. Another alternative is
Webmaster media maker
(http://www.webmastermediamaker.com/?hop=snichols)
Q. What is the quality like? A. Judge for yourself - visit
http://www.infotechcomms.co.uk/info10.htm and watch the
demonstration programme. The trick is to get the quality as high
as you can, but still make it playable on an average
modem-equipped home computer.
About the author:
Steve Nichols is a freelance journalist who runs InfoTech
Communications (http://www.infotechcomms.co.uk). A background in
radio means that Steve was ideally placed to take advantage of
the arrival of streaming media via the web.
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