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 with the distfile only available from LOCAL/ahze so the second option
would probably be for the best.
PLD Linux seems to have a bunch of patches for modern ffmpeg support if the
port really should be preserved:
A commit references this bug:
Date: Sun Jun 2 10:14:25 UTC 2019
New revision: 503301
Mark DEPRECATED with expiration date 2019-06-15
There has been no active development for several years. The port also
depends on other outdated, unmaintained code, most notably ffmpeg0
which is also scheduled for removal on 2019-06-15.
The functionality provided by this port is available through
multimedia/ffmpeg, which is actively maintained.
Reported by: tobik