Lots of interesting talks at the Big Apple Video event (that's Apple as in New York, not Mac Os X):
Probably the most interesting for this group is the second half of Ronald Bultje's talk which covers his Eve-AV1 encoder and some conparisons with other codec and encoders:
https://vimeo.com/344663992
But lots of other interesting stuff from other speakers too if you click through to the channel to see the full list.
I'll also mention this one from Cisco as it's got a kind of boring sounding title but had some interesting stuff around complexity Vs speed in AV1 after the live demos.
https://vimeo.com/344366650