This update provides and update to mythtv 30, and updates the bundled ffmpeg to 3.2. It also fixes at least the following issue:
The flvwritepacket function in libavformat/flvenc.c in FFmpeg through 4.0.2 does not check for an empty audio packet, leading to an assertion failure (CVE-2018-15822).
It also fixes mythbackend missing needed environment variables (mga#24104).
For other changes/fixes in this update, see the referenced Release Notes.