The live-video.net domain belongs to Twitch. So, from what I can gather, apparently the OP switched back to Twitch streaming and the last-hop RTMP server does not use certificates.
Me too. YouTube was given up, and what the op did was to use Twitch streaming and redirect it before the forward to a TLS-verifed server, bypassing verification:
> redirects the actual stream to the Mac without any certificate issues.