Nothing should depend on the known vulnerable multimedia/ffmpeg0. Either patch it to support modern ffmpeg or remove it. This project appears to be unmaintained upstream for 14 years now so the second option would probably be for the best.
I will write a patch to build it without ffmpeg and/or use the new API.
A commit references this bug: Author: dinoex Date: Mon Jun 3 09:19:01 UTC 2019 New revision: 503365 URL: https://svnweb.freebsd.org/changeset/ports/503365 Log: - drop dependency on multimedia/ffmpeg0 PR: 238094 Changes: head/multimedia/sabbu/Makefile
Thanks.