Re: Multiple Streaming
- From: "Neil Smith [MVP Digital Media]" <neil@xxxxxxxxxx>
- Date: Tue, 01 Nov 2005 17:19:32 GMT
On Mon, 31 Oct 2005 23:24:03 -0800, "Emerson Brito"
<EmersonBrito@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>Hi;
>
>I want to webcast the same source (audio & video) to 3 different publishing
>points at 3 different bitrates (like 24, 64, 128Kbps).
>
>I noticed i can do that using the osprey 210:
>http://www.viewcast.com/products/osprey/osprey210.html
>
>With the Simulstream plugin:
>http://www.viewcast.com/simulstream_main.html
>
>The problem is, the 210 card + simulstream upgrade cost up to $600.
>Is there any other card or solution for this with a better price?
Hmm, well windows media encoder can be set up to encode to multiple
bitrate streams at one time - pushing those up to the server *should*
get your server to offer all 3 streams.
It's not obvious how to do this though - Start a custom session. Click
on "Properties" button at the top. Choose the "Compression" tab.
Now choose WM Server (Streaming) from the destination dropdown -
you'll be offered CBR audio/video. Pick "Live broadcast video" and
"Voice Quality Audio" - modes.
On my machine I'm then shown predefined profiles running at 275, 110
and 28kbps at 320x240 25fps, 192x144 at 12.5fps for the other two.
Click the checkbox in the 110 and 28kbps (they're close enough to your
required bitrates) and click "Edit". Now on the screen which popped
up, click "Add" to add your ~64kbps stream to the other two. Type in
"64k". Change the video size to 192x144 again (or whatever the correct
aspect ratio is for your content)
OK out of all that and File->Save the profile for future use and
modification. You should be able to try that to your server, and set
the "Available Bandwidth" in media player to connect to the live
stream at different rates (modem, 64kbps ISDN and 128kbps Dual ISDN in
the Performance tab of media player)
Bear in mind you'll need fairly beefy general purpose computer
hardware to encode AV from a live capture source giving you PAL and
convert it down to those bitrates. I'd guess the Osprey would be
offering hardware encoding support to the computer, which would
require a lower spec machine. I suppose that's called a "trade off"
;-)
HTH
Cheers - Neil
.
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