FFmpeg from source in Ubuntu

build.sh

git clone https://git.ffmpeg.org/ffmpeg.git
cd ffmpeg

# Just enabling few important libraries, which are available in Ubuntu
# Also look at https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
./configure \
 --prefix=/usr \
 --enable-gpl \
 --enable-version3 \
 --enable-nonfree \
 --enable-shared \
 --enable-frei0r \
 --enable-libx264 \
 --enable-libx265 \
 --enable-libvpx \
 --enable-libfdk-aac \
 --enable-libmp3lame \
 --enable-libopus \
 --enable-libass \
 --enable-libtheora \
 --enable-libvorbis \
 --enable-libfreetype \
 --enable-libfribidi \
 --enable-libfontconfig \
 --enable-libgsm \
 --enable-libopencore-amrnb \
 --enable-libopencore-amrwb \
 --enable-libshine \
 --enable-libsnappy \
 --enable-libspeex \
 --enable-libtwolame \
 --enable-libv4l2 \
 --enable-libwebp \
 --enable-libvo-amrwbenc \
 --enable-opengl \
 --enable-libdrm

 # Use four threads to speed up
 make -j4
 
 sudo make install

encode-all-mov-mts.sh

# Encode all MOV files found recursively from the given directory.
# Skip any MOV files that have MP4 counterpart file already.

DIRECTORY=$(realpath "${1:-.}");
BITRATE=${2:-3200k}

IFS=$'\n' # split only on newlines
LIST=$(find "${DIRECTORY}" -maxdepth 4 -type f -iname '*.mov' -or -iname '*.mts');

echo "Encoding directory '${DIRECTORY}' with video bitrate ${BITRATE}";

# How much visual difference does "slow" and "slower" produce?
for MOVFILE in ${LIST}; do
  echo ${MOVFILE};
  MP4FILE="${MOVFILE%.*}.mp4"
  echo ${MP4FILE};
  if [ ! -f ${MP4FILE} ]; then
    # First pass
    ffmpeg -y -i "${MOVFILE}" -c:v libx265 \
     -preset slower -tune fastdecode -b:v ${BITRATE} \
     -x265-params pass=1 -c:a aac -b:a 128k \
     -f mp4 /dev/null;

    # Second pass
    ffmpeg -i "${MOVFILE}" -c:v libx265 \
     -preset slower -tune fastdecode -b:v ${BITRATE} \
     -x265-params pass=2 -c:a aac -b:a 128k \
     "${MP4FILE}";
  fi
done