[vlc] Re: Streaming at LinuxTag 2004

[Benjamin PRACHT]

On Wed, Jun 16, 2004, Torsten Spindler wrote :
> 
> For that purpose I plan to save the axis stream with
> vlc http/ps2://<camera ip>/axis-cgi/mpeg2/video.cgi
> This works flawlessly in a 100 MBit LAN, which is locally available.

Glad to hear that this works

> 
> To transcode a stream and send it over a low bandwidth network (<2
> Mbit/s, most likely 400kbit/s) I'll transcode it with
> vlc http/ps2://<camera ip>/axis-cgi/mpeg2/video.cgi --sout
> '#transcode{vcodec=mpv4,vb=128,acodec=mpga,ab=128}:std{access=udp,url=<outside ip>,mux=ts}'
> Is this a recommended procedure or would it be better to transcode it
> differently or add some information on bitrate tolerance?
> 

Well, a video birate of 128 kbit/s seems really little. You could a
least adjust the size of the video with the scale= or the size=
parametters.

Have a look here 

http://www.videolan.org/doc/vlc-user-guide/en/ch04.html#id2870280

for a more complete descriptions of transcoding options. You can for
instance add a vt parametter (in bps) if you want to make vbr streams.


> Once at a computer connected with high bandwidth I'd like to multicast
> it via MBONE. As far as I know Univeristy of Karlsruhe computers have
> access to it. Is there a recommended way to do and test this? 
> 

--sout
'#std{mux=ts,avvess=udp,url=multicast_address:port,sap,name="linuxtag}
--ttl 64 should do the trick. It will stream the video on the provided
address, and make the corresponding sap announcement. You might also
want to have a look at "sap-interval" option or at the experimental
"sap-flow-control" option.

Don't forget the --ttl 64 option, or your stream won't cross any router.

> Besides multicasting I'd like to make the live stream available via
> http, as most webcams with integrated webserver (as the Axis has) do. Is
> there a way to do this with vlc?
> 

Yes, use something like #std{access=http,mux=ts (or ps, or ogg),url=[optional address of
the interface to bind on the server]:port}

> Lastly when I get access to some TVs I'll use Amino STBs to display
> talks locally at LinuxTag.
> 

AFAIK, Amino STBs can access multicast streams, but only in mpeg2. That means
that you'll have to transcode the originial stream one more time, in
mpeg2 (vcodec=mp2v)

> Bye,
> Torsten
> 



-- 
$(echo "BigBen")

Oui je quote, et alors ?

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