This Echo Test demo just blindly sends you back whatever you send to it. You're basically attached to yourself, and so your audio and video you send to Janus are echoed back to you. The same is done for RTCP packets as well, with the information properly updated.
The demo also provides a few controls to manipulate the media
before you send them. You can mute audio and video, for instance,
which will tell the server to drop the frames and not echo them
back to you. You can also try and cap the bitrate: such control
will tell the server to manipulate the RTCP REMB packets passing
through, in order to simulate a bandwidth limitation. In case
you're interested in testing simulcasting or SVC, add a
?simulcast=true (for simulcast) or ?svc=<mode> (for SVC)
query string to the url of this page and reload it: buttons will appear
to allow you to try and switch between lower and higher quality
versions of the video you're capturing. Notice that you may have
to increase the bandwidth indicator to have the higher quality
versions appear, as the browser will not encode them otherwise.
Besides, notice that simulcast will only work when using VP8 or H.264
(or, if you're using a recent version of Chrome, VP9 and AV1 too),
while SVC will only work if you're using VP9 or AV1 on a browser that
supports setting the scalabilityMode.
Finally, this demo also includes Data Channels: whatever you write in the text box under your local video, will be sent via Data Channels to the plugins, modified by adding a fixed prefix, and sent back to you in the text area below the remote video.
janus.js, open the
Devices demo instead.?plugin=lua query string to the url of this page;
to talk to the Duktape plugin instead, use ?plugin=duktape.
Since they both share pretty much the same syntax as the stock
EchoTest plugin, most if not all features should work just the same way.Press the Start button above to launch the demo.