Update multimedia/mythtv and related ports to 29.1 [1]
Convert multimedia/mythtv-frontend to a slave port of multimedia/mythtv
which should make future updates much easier.
Upstream security patches have been added to address known
vulnerabilities in the bundled ffmpeg 3.2.
PR: 225652 (initial patches to update to 29.0) [1]
Submitted by: <lucylangthorne55@gmail.com> [1]
Differential Revision: https://reviews.freebsd.org/D14563