[1.x] Canvas capture isn't work in janus official demo at https://janus.conf.meetecho.com/demos/canvas.html (0.x working)

[timpisti]

What version of Janus is this happening on?
Since it is the official Janus demo, probably the newest.

Have you tested a more recent version of Janus too?
Yes, the latest version of demo isn't working my local server

Was this working before?
If you have information on a version/commit where the issue wasn't there (e.g., the result of a git bisect), please provide it here.

As I remember, I saw it working months ago, but not sure when.

Is there a gdb or libasan trace of the issue?
No.

Additional context
I try to fix a canvas content stream in webRTC with Janus, and isn't working (A canvas mixer locally show the canvas content, but stream only the webcam), and I looking for example, and find out it isn't working. Other sites solution seems to be working. (ttps://docs.flashphoner.com/display/WCS52EN/From+an+HTML5+Canvas+element+%28whiteboard%29+in+a+browser+via+WebRTC)

[lminiero]

We haven't touched the canvas demo in a very long time, so I'm not sure if anything changed there that needs fixing. To be honest, since it's a purely client side thing, it's a low priority thing for me. If you find canvas capturing code that works, it should work out of the box with Janus.