Add script to compile ffmpeg as static PIE binary

Signed-off-by: Adrian-George Dumitrache <adrian.dumitrache02@stud.acs.upb.ro>

Fixed formatting

Signed-off-by: Adrian-George Dumitrache <adrian.dumitrache02@stud.acs.upb.ro>

ffmpeg/.gitignore

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+/ffmpeg-5.1.2/
+/ffmpeg-5.1.2.tar.bz2*

ffmpeg/README.md

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+# Build ffmpeg as static PIE
+
+Script to build ffmpeg as a static PIE binary.
+
+## Requirements
+
+Make sure that you have the following packages installed:
+* GCC
+* GNU Make
+
+## Build
+
+Run the build.sh file.
+It will create a folder where the static PIE ffmpeg will be located.
+
+## Running
+
+```bash
+./ffmpeg -i rootfs/drop.avi drop_new.mp4
+```

ffmpeg/build.sh

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+#!/bin/bash
+
+link="https://ffmpeg.org/releases/ffmpeg-5.1.2.tar.bz2"
+
+# Clean up
+rm -fr ffmpeg-*
+
+echo -n "Downloading ffmpeg source code ... "
+wget -q "$link"
+echo ""
+echo -n "Unpacking ffmpeg ... "
+tar -xf ffmpeg-5.1.2.tar.bz2
+echo ""
+
+pushd ffmpeg-5.1.2/ > /dev/null 2>&1 || exit 1
+
+echo -n "Configuring ffmpeg ... "
+# Add PIC/PIE compile/link flags.
+./configure --extra-cflags="-fPIC" --extra-ldflags="-static-pie"  --disable-shared --disable-opencl
+echo ""
+
+echo -n "Building ffmpeg ..."
+make -j "$(nproc)"
+
+echo ""
+popd > /dev/null 2>&1 || exit
+
+ln -fn ffmpeg-5.1.2/ffmpeg .
+
+rm ffmpeg-5.1.2.tar.bz2*