Add instructions for compiling ffmpeg

.gitmodules

@@ -25,3 +25,6 @@
 [submodule "libev"]
 	path = libev
 	url = https://github.com/enki/libev.git
+[submodule "ffmpeg"]
+	path = ffmpeg
+	url = https://github.com/zimbatm/ffmpeg-static

README.md

@@ -112,6 +112,17 @@ $ gcc -static shutdown.c -o shutdown
 $ popd
 ```
 
+# Statically compiled ffmpeg
+This allows the ability to record the framebuffer and to stream to twitch
+
+``` shellsession
+$ pushd twitch
+$ git apply ../patches/ffmpeg/*.patch
+$ ./build.sh -j$(nproc)
+$ popd
+```
+
+
 # Finishing steps
 
 ``` shellsession

patch/ffmpeg/fix-build-flags.patch

@@ -0,0 +1,103 @@
+diff --git a/build.sh b/build.sh
+index 5199d9b..5a4a661 100755
+--- a/build.sh
++++ b/build.sh
+@@ -273,7 +273,7 @@ cd $BUILD_DIR/x265*
+ cd build/linux
+ [ $rebuild -eq 1 ] && find . -mindepth 1 ! -name 'make-Makefiles.bash' -and ! -name 'multilib.sh' -exec rm -r {} +
+ PATH="$BIN_DIR:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$TARGET_DIR" -DENABLE_SHARED:BOOL=OFF -DSTATIC_LINK_CRT:BOOL=ON -DENABLE_CLI:BOOL=OFF ../../source
+-sed -i '' 's/-lgcc_s/-lgcc_eh/g' x265.pc
++sed -i 's/-lgcc_s/-lgcc_eh/g' x265.pc
+ make -j $jval
+ make install
+
+@@ -341,7 +341,7 @@ if [ "$platform" = "linux" ]; then
+   sed -i "s/prefix=.*/prefix=${TARGET_DIR_SED}\nINC=-I\$(prefix)\/include/" ./Makefile
+   sed -i "s/SHARED=.*/SHARED=no/" ./Makefile
+ elif [ "$platform" = "darwin" ]; then
+-  sed -i "" "s/prefix=.*/prefix=${TARGET_DIR_SED}/" ./Makefile
++  sed -i "s/prefix=.*/prefix=${TARGET_DIR_SED}/" ./Makefile
+ fi
+ make install_base
+
+@@ -358,7 +358,7 @@ cd $BUILD_DIR/vid.stab-release-*
+ if [ "$platform" = "linux" ]; then
+   sed -i "s/vidstab SHARED/vidstab STATIC/" ./CMakeLists.txt
+ elif [ "$platform" = "darwin" ]; then
+-  sed -i "" "s/vidstab SHARED/vidstab STATIC/" ./CMakeLists.txt
++  sed -i "s/vidstab SHARED/vidstab STATIC/" ./CMakeLists.txt
+ fi
+ PATH="$BIN_DIR:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$TARGET_DIR"
+ make -j $jval
+@@ -426,35 +426,10 @@ if [ "$platform" = "linux" ]; then
+     --extra-libs="-lpthread -lm -lz" \
+     --extra-ldexeflags="-static" \
+     --bindir="$BIN_DIR" \
+-    --enable-pic \
+-    --enable-ffplay \
+-    --enable-fontconfig \
+-    --enable-frei0r \
+     --enable-gpl \
+-    --enable-version3 \
+-    --enable-libass \
+-    --enable-libfribidi \
+-    --enable-libfdk-aac \
+-    --enable-libfreetype \
+-    --enable-libmp3lame \
+-    --enable-libopencore-amrnb \
+-    --enable-libopencore-amrwb \
+-    --enable-libopenjpeg \
+-    --enable-libopus \
+     --enable-librtmp \
+-    --enable-libsoxr \
+-    --enable-libspeex \
+-    --enable-libtheora \
+-    --enable-libvidstab \
+-    --enable-libvo-amrwbenc \
+-    --enable-libvorbis \
+-    --enable-libvpx \
+-    --enable-libwebp \
+-    --enable-libx264 \
+-    --enable-libx265 \
+-    --enable-libxvid \
+-    --enable-libzimg \
+     --enable-nonfree \
++    --enable-libx264 \
+     --enable-openssl
+ elif [ "$platform" = "darwin" ]; then
+   [ ! -f config.status ] && PATH="$BIN_DIR:$PATH" \
+@@ -466,33 +441,10 @@ elif [ "$platform" = "darwin" ]; then
+     --extra-ldflags="-L$TARGET_DIR/lib" \
+     --extra-ldexeflags="-Bstatic" \
+     --bindir="$BIN_DIR" \
+-    --enable-pic \
+-    --enable-ffplay \
+-    --enable-fontconfig \
+-    --enable-frei0r \
+     --enable-gpl \
+-    --enable-version3 \
+-    --enable-libass \
+-    --enable-libfribidi \
+-    --enable-libfdk-aac \
+-    --enable-libfreetype \
+-    --enable-libmp3lame \
+-    --enable-libopencore-amrnb \
+-    --enable-libopencore-amrwb \
+-    --enable-libopenjpeg \
+-    --enable-libopus \
+     --enable-librtmp \
+-    --enable-libsoxr \
+-    --enable-libspeex \
+-    --enable-libvidstab \
+-    --enable-libvorbis \
+-    --enable-libvpx \
+-    --enable-libwebp \
+-    --enable-libx264 \
+-    --enable-libx265 \
+-    --enable-libxvid \
+-    --enable-libzimg \
+     --enable-nonfree \
++    --enable-libx264 \
+     --enable-openssl
+ fi
+

setup_emacs_rootfs.sh

@@ -11,3 +11,6 @@ sudo cp -r ncurses/build/share/terminfo/ "$ROOTFS_MNT/share/"
 sudo cp -r .emacs.d "$ROOTFS_MNT/"
 sudo cp shutdown/shutdown "$ROOTFS_MNT/sbin/shutdown"
 sudo ln -s shutdown "$ROOTFS_MNT/sbin/reboot"
+if [ -e "./ffmpeg/bin/ffmpeg" ]; then
+    sudo cp ffmpeg/bin/ffmpeg "$ROOTFS_MNT/bin/ffmpeg"
+fi