As announced last April, all live video uploads will be required to use RTMPS (RTMP over a TLS/SSL connection) by May 1, 2019, and it's important that developers take the time to ensure that their integration is compliant before this date.
We're committed to protecting the integrity of the Facebook platform, and as part of this work, we're requiring that live video uploads use RTMPS as it provides a greater level of security for the video content. Integrations using RTMP will not continue to work after the deadline.
If you're using librtmp, then you can make these changes to switch over to RTMPS:
secure_stream_urlfields which will both contain the secure RTMPS URL.
To learn more, visit our developer documentation.