[streaming] Re: Venus 2004 : which architecture ?

[Benjamin PRACHT]

Hello, here are 1 or 2 ideas about your project :

- The archtecture  you are panning makes sense to  me. However, be aware
that you'll need a quite recent computer  tu plug the webcam in : you'll
need to make  real time encoding, which requires some  cpu power (p4 1.5
GHz for real time fullscreen MPEG4 encoding).

- which  way will you  use to  stream on the  internet on the  servers ?
Using vlc  as a  udp multicast  -> http  proxy would  make sense,  in my
opinion. However, be  aware that, as far  as I know, no  high load test,
with lots of http  connections have been made on vlc.  In fact, we would
be pleased to get some feedback on that point

- vlc is unable to command a dv camera directly. You will need to use an
external program  to set the  camera, then  have vlc read  the resulting
video  directly on  a  device /  fifo,  and transcode  the  result in  a
streamable  format. This  should  be possible,  but  hasn't really  been
tested, AFAIK.


> Hello,
> 
> In june 2004, planet Venus will be for a  few  hours
> just between earth and sun. From the earth  we  will
> see the planet slowly crossing the sun's disk.  This
> is a rather rare  event  (2  occurrences  every  128
> years).
> 
> At this occasion I plan to setup a live  webcast  of
> this  event,  using  a   telescope   here   at   the
> observatory coupled with a webcam, and optionnally a
> digital camcorder to show the scope  itself,  people
> hanging around and some interviews before and during
> the event or in case of bad weather.
> 
> I am trying to decide the best  architecture  to  do
> that using vlc.
> 
> I was heading to a solution like this :
> 
>  a laptop connected to the scope webcam streaming in
>  multicast to a few (2-4) machines relaying  out  to
>  the internet.
> 
> Could experts tell me what  they  think  about  that
> solution and  some  technical  clues  about  how  to
> realise that ?
> 
> The webcam has been tested with vlc, works fine.
> 
> I did not test the camcorder yet, but I  think  this
> will not be a problem with a iee1394 interface.
> Thank you in advance,
> 
> Regards.
> 
> -- Francois Meyer   (alias eul'dulle, ex ingesys ecp :-))
> Tel : (+33) 3 81 66 69 27   Fax : 3 81 66 69 44 
> Observatoire de Besancon - BP1615 - 25010 Besancon cedex - FRANCE
> **** Université de Franche-Comté ****** CNRS UMR 6091 *****
> 
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-- 
$(echo "BigBen")

Oui je quote, et alors ?

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