MISC: try ffmpeg build on macOS

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

misc/macbuild.sh

@@ -2,7 +2,7 @@
 set -Eeo pipefail -x
 
 # install dependencies
-brew install autoconf-archive automake libsndfile fftw mpg123 libgcrypt libtool
+brew install autoconf-archive automake libsndfile fftw mpg123 libgcrypt libtool ffmpeg
 
 # build zita-resampler
 git clone https://github.com/swesterfeld/zita-resampler
@@ -15,3 +15,8 @@ export DYLD_LIBRARY_PATH=/usr/local/lib:$DYLD_LIBRARY_PATH
 ./autogen.sh
 make
 make check
+# build audiowmark with ffmpeg support
+make clean
+./autogen.sh --with-ffmpeg
+make
+make check