diff --git a/ffmpeg/build.sh b/ffmpeg/build.sh
old mode 100644
new mode 100755
index ad14677..ff631fd
--- a/ffmpeg/build.sh
+++ b/ffmpeg/build.sh
@@ -1,13 +1,43 @@
-#!/bin/bash
-set -e
+#!/bin/sh -e
 
 # ANDROID_NDK_ROOT and ANDROID_SDK_ROOT need to be set (possibly to ~/Android/Sdk/ndk/##.#.#######/ and ~/Android/Sdk respectively)
 
 export ANDROID_NDK_ROOT=/usr/local/android-ndk
 export ANDROID_SDK_ROOT=/usr/local/android-sdk
 
-VERSION=7.1.1
-OUT_DIRECTORY=ffmpeg-android-$VERSION-aarch64
+FFMPEG_FLAGS=(--enable-gpl \
+    --enable-x264 \
+    --enable-libvpx \
+    --enable-android-media-codec \
+    --disable-arm-v7a-neon \
+    --disable-arm-v7a \
+    --disable-x86 \
+    --no-archive)
+
+ARCH="$1"
+
+if [ "$ARCH" = '' ]; then
+    ARCH=aarch64
+else
+    shift
+fi
+
+if [ "$VERSION" = '' ]; then
+    VERSION=7.1.1
+else
+    shift
+fi
+
+if [ "$ARCH" = "aarch64" ]; then
+    FFMPEG_FLAGS=("${FFMPEG_FLAGS[@]}" --disable-x86-64)
+elif [ "$ARCH" = "x86_64" ]; then
+    FFMPEG_FLAGS=("${FFMPEG_FLAGS[@]}" --disable-arm64-v8a)
+else
+    echo "Invalid architecture $ARCH"
+    exit 1
+fi
+
+OUT_DIRECTORY=ffmpeg-android-$VERSION-$ARCH
 
 if [ ! -d "ffmpeg-kit" ]; then
     tar xf ffmpeg-kit.tar.xz
@@ -15,16 +45,7 @@ fi
 
 cd ffmpeg-kit
 
-./android.sh \
-    --enable-gpl \
-    --enable-x264 \
-    --enable-libvpx \
-    --enable-android-media-codec \
-    --disable-arm-v7a-neon \
-    --disable-arm-v7a \
-    --disable-x86-64 \
-    --disable-x86 \
-    --no-archive
+./android.sh "${FFMPEG_FLAGS[@]}"
 
 cd ..
 
@@ -35,4 +56,3 @@ cp -r ffmpeg-kit/prebuilt/android-arm64/{ffmpeg,libvpx,x264}/* $OUT_DIRECTORY/
 cp ffmpeg-kit/src/ffmpeg/config.h ffmpeg-kit/src/ffmpeg/libavcodec/codec_internal.h $OUT_DIRECTORY/include/libavcodec/
 
 tar c $OUT_DIRECTORY | xz -T0 > $OUT_DIRECTORY.tar.xz
-
diff --git a/ffmpeg/ffmpeg-android-v4.4.LTS.tar.xz b/ffmpeg/ffmpeg-android-v4.4.LTS.tar.xz
new file mode 100644
index 0000000..d32748d
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diff --git a/ffmpeg/ffmpeg-android-v5.1.LTS-aarch64.tar.xz b/ffmpeg/ffmpeg-android-v5.1.LTS-aarch64.tar.xz
new file mode 100644
index 0000000..3bbb591
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diff --git a/ffmpeg/ffmpeg-android-v5.1.LTS-x86_64.tar.xz b/ffmpeg/ffmpeg-android-v5.1.LTS-x86_64.tar.xz
new file mode 100644
index 0000000..dbfac90
Binary files /dev/null and b/ffmpeg/ffmpeg-android-v5.1.LTS-x86_64.tar.xz differ
diff --git a/ffmpeg/ffmpeg-android-v5.1.LTS.tar.xz b/ffmpeg/ffmpeg-android-v5.1.LTS.tar.xz
new file mode 100644
index 0000000..b2cccdd
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