RTP streaming/tunneling over Internet

[Jeff Shanab]

A somewhat tricky technique i have used is first use tcp from inside the
firewall to clientpc this is a long poll. Return command to play in the
long poll response.
I was doing video from a camera. I then used rtsp to connect and get SDP
from camera, which I sent, tcp, to a port on the client.
This incoming connection was "Hijacked" The port now used from the client
side, with a new, normal rtsp session. Just reach down thru the firewall on
the already established session from inside the firewall, and pulled the
video.

This was first seen on SERCOM cameras ;-)

On Thu, Feb 24, 2022 at 4:18 PM Chris Hallinan via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> wrote:

> Hi Team,
>
> I built an application for Apple/MAC to control a radio remotely.  I chose
> gstreamer as the audio streaming infrastructure.  It works great with low
> latency, etc.  Now, however, I'd like to get it working where I can be
> remote (ie outside of my private home network.).  The "server side"
> (connected to the radio on my private network) uses rtpL16pay through
> rtpjitterbuffer to the remote client using rtpL17depay similarly.
> Basically it just spits out UDP RTP packets on port 5000 to whatever remote
> host I choose.
>
>            gstreamer    Typ. Home      Public  Private      gstreamer
> [radio] -- [Server] -- [NAT Router] -- [I'net] -- [NAT] -- [Client PC]
>
> However, to the best of my knowledge, this is not routable over the public
> Internet through my NAT router.  The basic problem is that I'd need to
> configure port forwarding on the remote side for this to work, and when
> you're sitting in a hotel somewhere, that option doesn't exist.
>
> I'm figuring I'd need to connect in from a remote location to a "server"
> element on my private lan (using port forwarding) and then somehow tunnel
> the RTP audio back to me through some type of RTP-compatible tunnel.
>
> Does anyone know of a solution to this?  I'm pretty handy - pointed in the
> right direction, I can figure things out, but I'm not sure what direction
> to go.
>
> Any advice would be appreciated.
>
> Thanks!
>
> Chris
> 73 de K1AY
>
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