[Elphel-support] Streamer settings and SDP

[Scott Janz]

unicast/udp without tcp acknowledgement is what we need. The stream 
needs to be sent via UDP to a storage/wide-band router device. All this 
device does is store incoming packets and provide routing from the 
aircraft to the ground, it can't perform any client-type interactions 
and I don't think it is configured to "see" the multicast group addresses. 

The network looks like this:

camera->PC LAN (10.3.1.x)->ethernet switch->wide-band router WAN 
(128.102.142.x)->users


If the camera streamer can not be configured to do this then perhaps I 
can use VLC on the PC to re-stream, but I am worried about CPU overhead 
since the PC is used for running our other instruments. We also need to 
grab the SDP information prior to the WAN and provide it to user clients 
who connect to the stream.

-scott

Andrey Filippov wrote:
>
>     or alternatively can the camera streamer be configure to unicast UDP?
>
>
> Scott, honestly  I do not have an immediate answer - if that is 
> possible. As I understand unicast/multicast and tcp/udp go together - 
> in unicast mode the source talks to a particular client, so the 
> packets can be acknowledged (tcp). In multicast mode there is 
> naturally no way to acknowledge packets from all the clients so you 
> have to use udp. Why multicast/udp does not work for you?  You are 
> trying to avoid flooding the network with the packets? That can be 
> solved  with some router - either a dedicated hardware or just having 
> the camera connected to a single computer to a dedicated Ethernet port 
> (and use this computer as a router if you need access the camera from 
> another hosts).
>
> Andrey
>

-- 

---------------------
Dr. Scott J. Janz
NASA/GSFC code 613.3
Building 33 Room E310
Greenbelt, MD 20771
ph. 301-614-5987
fax 301-614-5903