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List:       ms-wmtalk
Subject:    AW: Automatic rollover to backup stream
From:       Tim Ebert <t.ebert () MES-INFO ! DE>
Date:       2002-09-30 19:15:00
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Hi Charly,

Try this workaround (I´m not the author) which I used myself in our
R.E.M. webcast in 2001. In that case I pointed a unicast to that
multicast in order to distribute it to internet users.

"Setup a station for distribution only.
Setup a program with 2 streams
    Stream 1 sources from encoder #1
    Stream 2 sources from encoder #2
Setup your unicast pub point sourcing from the station.
Start both encoders
Start the program (make sure you DO NOT choose stop on errors when
setting
up the program)
Then at the specific time you want it to switch stop encoder1 and it
will
switch to encoder #2.

What should happen is the program would detect the stream has stopped
and
switch to encoder #2. If you want to go back to encoder #1 start encoder
#1
then stop encoder #2

You need to make sure you have NOT choosen stop on errors . You might
want
to slect play forever if you want to switch back and forth between the 2
streams... If you do not want to go back to encoder 1 from encoder 2 you
dont need the play forever option enabled in the program..  Using 2
streams
pointing to the 2 encoders encoding the same source is also a way to
build a
type of redundancy in your encoding, if for some reason one encoder
stops -
which we all know should never happen 8^) - the program will switch over
to
a back up encoder encoding the same feed.....

This might be something you could work with...  Using the other advanced
stream options there are some variations you could pull off such as
specific
a duration for stream #1 and start the program relative to the time you
want
the stream to switch to encoder #2."

Cheers,
Tim

____________________________________

MediaEvent Services OHG
Charlotte-Bamberg-Str. 6
35578 Wetzlar
Germany

Telefon/Phone +49 6441 87087-20
Telefax/Fax +49 6441 87087-17
eMail t.ebert@mes-info.de 
Internet http://www.mes-info.de
____________________________________
 

-----Ursprüngliche Nachricht-----
Von: WMTalk [mailto:WMTalk@DISCUSS.MICROSOFT.COM] Im Auftrag von Charlie
Reid
Gesendet: Montag, 30. September 2002 08:48
An: WMTalk@DISCUSS.MICROSOFT.COM
Betreff: Automatic rollover to backup stream


I am using Windows Media Services 4.1 to multicast a stream across our
intranet. I would like to introduce some redundancy into our system by
using 2 encoder PCs.  What I have in mind is this :
- I have 2 encoders each sending a stream to the server,
- the server treats one of the encoders as the primary stream and the
other as the backup,
- if the primary stream fails for whatever reason, the server cuts over
to the backup stream automatically,
- the clients don't have to do anything but will probably notice some
delay/re-buffering as streams switch over.

I can't find any way to do this in the media administrator or by using
ASX files.  Does anyone have any clues?

Multimedia and Online Learning
Technology Infrastructure Branch




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