I was going to write out a long drawn-out question with tons of details about my circumstance, but figured even though questions are usually much more detailed on here, this one is pretty simple (although I can't seem to find an answer for it after hours of Googling):
How do I disable certificate verification in ffmpeg for streaming to an RTMPS server?
i.e. I want to trust any certificate, regardless of its validity, without throwing a TLS fatal alert.