WebRTC with data channel only?

[William Gerecke]

I'm still having this problem first posted in March.  I'm using GStreamer
webrtcbin to send data over a WebRTC data channel and all is working well!
The only problem is for the data channel to be established I also need to
specify a dummy audio stream as follows:

pipe1 = gst_parse_launch("webrtcbin  name=sendrecv "
 "audiotestsrc is-live=true  ! audioconvert ! audioresample ! queue !
opusenc  ! rtpopuspay ! "
 "queue ! " RTP_CAPS_OPUS "97 ! sendrecv. ", &error);

When I try webrtcbin by itself or with a fakesrc instead of an audio source
I can still create the data channel as below without errors but I never get
the "on-open" callback like I do when an audio source is present.

g_signal_emit_by_name(webrtc1, "create-data-channel", "channel", NULL,
&send_channel);
if (send_channel) {
  g_print("Created data channel\n");
  connect_data_channel_signals(send_channel, session);
}

So in short - can webrtcbin be configured to work with only data channels,
and if so, what am I missing?

Bill

On Tue, Mar 31, 2020 at 11:30 AM Bill G <foatus at hotmail.com> wrote:

> Hello,
>
> I'm trying to get a webrtcbin running which has data channels only (i.e.
> no audio, no video.)  I started with the working sendrecv example and got
> to the point where I had a working data-channel with audio only.  When I
> remove audio the data channels fail to connect - one data channel is
> created by GStreamer code, another intiated on the browser side.
>
> I found and example (link below) for only receiving streams in which the
> gst_parse_launch() was removed and one-way transceivers manually added.  I
> read that without a audio/video sink pad connected the transceivers need to
> be manually created.  Maybe this is also related to data channels not
> functioning?
>
>
> https://github.com/centricular/gstwebrtc-demos/compare/master...a-morales:figure-out-transceivers?expand=1
>
> So, I'm assuming there is something preventing these data-channels from
> getting established, and asking how to get past it?  This is with
> everything running on one machine, Windows and GStreamer 1.16.  Thanks in
> advance!
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>
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