diff --git a/.github/workflows/scripts/macos/build-dependencies.sh b/.github/workflows/scripts/macos/build-dependencies.sh
index 48d50d3be2..f6b3e12c76 100755
--- a/.github/workflows/scripts/macos/build-dependencies.sh
+++ b/.github/workflows/scripts/macos/build-dependencies.sh
@@ -7,6 +7,10 @@ if [ "$#" -ne 1 ]; then
     exit 1
 fi
 
+# The bundled ffmpeg has a lot of things disabled to reduce code size.
+# Users may want to use system ffmpeg for additional features
+: ${BUILD_FFMPEG:=1}
+
 export MACOSX_DEPLOYMENT_TARGET=11.0
 
 NPROCS="$(getconf _NPROCESSORS_ONLN)"
@@ -102,22 +106,24 @@ make -C build "-j$NPROCS"
 make -C build install
 cd ..
 
-echo "Installing FFmpeg..."
-rm -fr "ffmpeg-$FFMPEG"
-tar xf "ffmpeg-$FFMPEG.tar.xz"
-cd "ffmpeg-$FFMPEG"
-LDFLAGS="-dead_strip $LDFLAGS" CFLAGS="-Os $CFLAGS" CXXFLAGS="-Os $CXXFLAGS" \
-	./configure --prefix="$INSTALLDIR" \
-	--enable-cross-compile --arch=x86_64 --cc='clang -arch x86_64' --cxx='clang++ -arch x86_64' \
-	--disable-all --disable-autodetect --disable-static --enable-shared \
-	--enable-avcodec --enable-avformat --enable-avutil --enable-swresample --enable-swscale \
-	--enable-audiotoolbox --enable-videotoolbox \
-	--enable-encoder=ffv1,qtrle,pcm_s16be,pcm_s16le,*_at,*_videotoolbox \
-	--enable-muxer=avi,matroska,mov,mp3,mp4,wav \
-	--enable-protocol=file
-make "-j$NPROCS"
-make install
-cd ..
+if [ "$BUILD_FFMPEG" -ne 0 ]; then
+	echo "Installing FFmpeg..."
+	rm -fr "ffmpeg-$FFMPEG"
+	tar xf "ffmpeg-$FFMPEG.tar.xz"
+	cd "ffmpeg-$FFMPEG"
+	LDFLAGS="-dead_strip $LDFLAGS" CFLAGS="-Os $CFLAGS" CXXFLAGS="-Os $CXXFLAGS" \
+		./configure --prefix="$INSTALLDIR" \
+		--enable-cross-compile --arch=x86_64 --cc='clang -arch x86_64' --cxx='clang++ -arch x86_64' \
+		--disable-all --disable-autodetect --disable-static --enable-shared \
+		--enable-avcodec --enable-avformat --enable-avutil --enable-swresample --enable-swscale \
+		--enable-audiotoolbox --enable-videotoolbox \
+		--enable-encoder=ffv1,qtrle,pcm_s16be,pcm_s16le,*_at,*_videotoolbox \
+		--enable-muxer=avi,matroska,mov,mp3,mp4,wav \
+		--enable-protocol=file
+	make "-j$NPROCS"
+	make install
+	cd ..
+fi
 
 echo "Installing Zstd..."
 rm -fr "zstd-$ZSTD"