dvbcut: use ffmpeg pg

multimedia/dvbcut/Portfile

@@ -3,6 +3,7 @@
 PortSystem          1.0
 PortGroup           github 1.0
 PortGroup           qt5 1.0
+PortGroup           ffmpeg 1.0
 
 github.setup        bernhardu dvbcut-deb 0.7.4 v
 github.tarball_from archive
@@ -24,13 +25,12 @@ checksums           rmd160  c64e2d51c84e35a3d01032b62f8947f90b70500c \
                     sha256  e1009e264079c0fdd3b423a84c31aafd0c3069cd137edbd6e2b16e884550f66e \
                     size    194965
 
-set ffmpeg_ver      6
+ffmpeg.version      6
 
 depends_build       port:pkgconfig
 qt5.depends_build_component qttools
 
 depends_lib         port:a52dec \
-                    port:ffmpeg${ffmpeg_ver} \
                     port:libao \
                     port:libmad
 
@@ -39,8 +39,6 @@ compiler.cxx_standard   2011
 use_autoreconf      yes
 
 configure.cxxflags-append   -std=c++11
-configure.cppflags-prepend  -I${prefix}/libexec/ffmpeg${ffmpeg_ver}/include
-configure.ldflags-prepend   -L${prefix}/libexec/ffmpeg${ffmpeg_ver}/lib
 
 configure.env       PATH=$env(PATH):${prefix}/libexec/qt5/bin
 build.env           PATH=$env(PATH):${prefix}/libexec/qt5/bin