[Live-devel] Axis RTSP Relay

[Bryan Thrasher]

The way the Wowza server works in my usgage is you tell it to pull a stream
from the camera via RTSP.  The M1011 only allow MPEG4 and H.264 over RTSP
(maybe that's an RTSP specification).  The camera produces the h.264
Baseline level 3 which is packaged up in a playlist for the iPhone.  But the
underlying stream format must be iPhone compatible because Wowza does not do
any transcoding.

The Wowza server can also listen for rtsp connections from encoders like
VLC.

The crux of my issue is that the Axis camera cannot initiate the connection
to the Wowza server.  It can only listen as a server.  So what I am trying
to accomplish is loading some software on the camera that will initiate an
rtsp connection to Wowza and send the output from the encoder that is built
into the camera, or hand off to Wowza to let it start pulling it.

I saw somewhere on the openRTSP pages that you can initiate a connection
with openRTSP and then have another program handle the actual streaming
data.  I have extremely limited knowledge of RTSP.  But, would it be
possible for openRTSP or even a shell script running on the camera to
initiate the RTSP connection and let Wowza take over the interaction?
Theoretically, can you speculate on what that RTSP "exchange" would look
like?  I could take that and pose it to the Wowza developers to see if they
can work with it.

Thanks for your help!

-----Original Message-----
From: live-devel-bounces at ns.live555.com
[mailto:live-devel-bounces at ns.live555.com] On Behalf Of Ross Finlayson
Sent: Monday, July 05, 2010 10:17 PM
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] Axis RTSP Relay

>What I would like to do is both of the following:
>1)      Run a program on the M1011 that will "restream" to the Wowza 
>Server acting as a client.
>a.       It will either pull directly from the h.264 encoder or from 
>the rtsp server built into the camera and send to Wowza.
>b.      It would need to initiate the connection to Wowza on start up
>c.       It would need to recover the connection if it dropped.
>2)      Run a program on a Linux PC on the same network as the cameras.
>a.       It will pull from each camera and send to Wowza.
>b.      It would also record the streams.
>c.       It would need to have some sort of way to send recordings 
>to the Wowza server on-demand.  Maybe there would be a program that 
>would poll the server every so often looking to see if a recording 
>was needed.
>
>It seems like a combination of LIVE555 Media Server and openRTSP 
>could work assuming they can be wired together, sort of in reverse.

I don't know what protocol(s) the 'Wowza' server uses to receive 
incoming streams (that it then re-streams to clients, as a server), 
but if it uses the same protocol that Apple 'Darwin Streaming Server' 
uses, then you may be able to use our "DarwinInjector" class.

(For two example applications that use this class, see the code for 
"testMPEG1or2AudioVideoToDarwin" and "testMPEG4VideoToDarwin")


>  It may also make sense to use LIVE555 Media Server instead of 
>Wowza.  Can it stream to iPhone?

Not at present, because the iPhone doesn't use RTSP/RTP.  Instead, it 
uses Apple's "HTTP live streaming protocol".  I have thought about 
possibly supporting this as an option in our server, but right now 
it's just a thought (there are so many other things on my plate).
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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