Hello experts,
We would like to make use of Flash Media Server as our
streaming server to make a live video broadcast on the website. Bit
rate 500 kb/sec is the video quality requirement. Is that mean each
session will use up 500kb? We expect there will be 1000 concurrent
sessions to our website to see the live broadcast online. Is that
mean 500kb x 1000 = 500MB bandwidth will be used at that period of
time? We urgently need to know if there is any configuration /
settings in the server to reduce the cost to pay for the internet
(we may need to pay for a 1GB broadband which is expensive) without
making the video quality poor. Any idea?
-FATKUEN|||
Are you going to use On2 VP6 w/ Flash Media Encoder? If you
set the video to 500 kbps, then it will roughly stay around that
number for the actual bandwidth. This could be for video only
though, so you’ll have to make sure that you figure in audio if you
haven’t already. An 11 Khz audio rate will use up around 31-33
kbps. With 1,000 users you will use roughly 500 mbps (megabits per
second). You’ll want to have probably at least 768 kbps upload on
the broadcasting connection too.
Are you using a CDN / Streaming service?
How long are you planning on running the event?|||
Thanks for your information MMLincoln =)
I am not sure if we are going to use On2 VP6 – i have to
confirm with my technical guy. You have also raise a good point
about the bandwidth for audio which we have never think about. What
we are really concern is the international bandwidth we would like
to buy from ISP in order to make sure the users in other countries
can view the video very smoothly. Is 10MB enough for 1000
concurrent users with 768 mbps?|||
500kbps x 1000 stream = ~ 500 mbps inevitable;
apart from using On Vp6, you may also want decrease the frame
rate a bit <20 fps depending upon motion in your live stream.
using these two ways you should be able to achieve similar video
quality with lesser bandwidth consumption per stream.
|||
Thanks. But do you think a dedicated 10 MB broadband enough
to cater these 1000 concurrent sessions?
It is actually a live racing broadcast channel so I’m not
sure if decrease the frame rate will help. Would you please
advice?|||
Theoretically 10 Mbps broadband is sufficient for only 20 (19
downstream + 1 up-stream); In practice, this number will go lower
due to network fluctuation (even a fluctuating clients link can
make FMSs network usage fluctuate due to buffer settings). Also,
one should to keep some bandwidth spare as initial data transfer
FMS to flash player can be a bit more due to client buffer
settings.|||
That’s unfortunate – as the money to pay for the
international bandwisth is really expensive. Just wanna think of
any approach wich can save bandwidth without making the quaility
poor.
I heard that we can set either unicast or multicast for
broadcasting. Is that a possible way to save the bandwidth?|||
I would recommend setting up a test system. Just take a
recording of a previous event or a similar racing video and pipe
that into your capture card and through the flash server. Load up
Flash Media Encoder (for On2 VP6) and a viewer and start tweaking
the audio/video settings until you find something that will work
for you. It possible that you might be able to get by with
something lower than 500 kbps.
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