[Bug 293832] emulators/vice: about FFmpeg 4 going away in tree (and gui hangs recording with ffmpeg)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293832

            Bug ID: 293832
           Summary: emulators/vice: about FFmpeg 4 going away in tree (and
                    gui hangs recording with ffmpeg)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: dinoex@FreeBSD.org
          Reporter: discipline@tiscali.it
          Assignee: dinoex@FreeBSD.org
             Flags: maintainer-feedback?(dinoex@FreeBSD.org)

I noticed several PR about "FFmpeg 4 is going away in tree".
I just want to report that emulators/vice has a FFMPEG OPTION (non DEFAULT)
which introduce a dependency on multimedia/ffmpeg4:

FFMPEG_LIB_DEPENDS=             libavcodec.so.58:multimedia/ffmpeg4
FFMPEG_CONFIGURE_ENV=          
PKG_CONFIG_PATH="${LOCALBASE}/ffmpeg4/libdata/pkgconfig"

In Makefile:
FFMPEG_CONFIGURE_ENABLE=        ffmpeg
but configure outputs:
configure: WARNING: invalid option: --enable-ffmpeg
or
configure: WARNING: invalid option: --disable-ffmpeg

Even if the configure option is disabled, the option to start a video recording
with ffmpeg exists.
The selection is "FFMPEG (Executable)" while the default one is "ZMBV
(Library)", which make me think that it calls the ffmpeg executable directly
and it's not going to use ffmpeg libraries.

In any case, starting a video recording with FFMPEG option freezes the GUI
(e.g. x64) for me.

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