Hi all,

as explained in response to another simulcast-related post on this forum, I've 
recently started playing with simulcast in order to support it in Janus. Just 
FYI in case it's of interest, there's a detailed explaination of what I've done 
and managed to get working so far here: 
https://github.com/meetecho/janus-gateway/pull/944

It seems to work really well with Firefox, especially Firefox 56, but I haven't 
been able to get temporal scalability working yet. Philipp Hancke pointed me to 
a bugzilla page talking of this, and saying this should be available and active 
since v55: https://bugzilla.mozilla.org/show_bug.cgi?id=1343143
Anyway, I don't seem to ever see any temporal layer but 0 when testing with 
Firefox 56. Is it only available on some OS (I've only tested on Fedora 25)? If 
not, do I need to set some additional properties when configuring the RIDs, or 
should this be automatic? In all my tests, I'm configuring the sender as such:

sender.setParameters({encodings: [
        { rid: "high", active: true, priority: "high", maxBitrate: 1000000 },
        { rid: "medium", active: true, priority: "medium", maxBitrate: 300000 },
        { rid: "low", active: true, priority: "low", maxBitrate: 100000 }

Thanks in advance for any useful feedback on this!
Lorenzo
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