ffmpeg-add-watermark.sh

#!/bin/bash
set -o errexit
set -o pipefail

usage() {
  echo
  echo "Pass a source file and an output name."
  echo "usage: `basename $0` source.mp4 Final.mp4 [start_time] [end_time]"
  echo " -h --help     Print this help."
  echo " -f --final    Disable the ultrafast preset to produce a final file."
  exit
}
if [ $# -lt 2 ]; then usage
else
preset="-preset ultrafast"
  options=$(getopt -l "final,help" -o "fh" -a -- "$@")
  eval set -- "$options"
  while true
  do
    case $1 in
    -f|--final) 
        preset=""
        ;;
    -h|--help) 
        usage
      shift
        ;;
    --)
        shift
        break;;
    \?) 
      echo "$OPTARG is not a valid option."
      usage
      shift
      break;;    
    esac
    shift
  done
if [ ! -z "$3" ]; then
starttime="$3" 
start_opt="-ss $3" 
else 
starttime=0
start_opt=""
fi 
if [ ! -z "$4" ]; then
endtime="$4" 
end_opt="-to $4" 
else 
endtime="$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$1" | tr -d $'\r')"
end_opt=""
fi
length1="$(echo $endtime - $starttime | bc)"
length2="$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 outro.mp4 | tr -d $'\r')"
wmlength="$(echo $length1 - 5 | bc)"  
  read -p "Enter fade duration in seconds: " -ei 2 fadeduration
  if ! [[ "$fadeduration" =~ ^[0-9]+$ ]] || [[ "$fadeduration" -eq 2 ]]; then 
    fadeduration=2 
    echo "WARNING: defaulting to $fadeduration seconds."
  else echo "Using fade duration of $fadeduration."
  fi
  wmstream1="[1:v]lut=a=val*0.7,fade=in:st=15:d=3:alpha=1,fade=out:st=$wmlength:d=3:alpha=1[v1];"
  wmstream2="[v1][tmp]scale2ref=w=oh*mdar:h=ih*0.07[wm_scaled][video];"
  read -e -n1 -p "Select watermark position:
1) Bottom left
2) Top left
3) Top right
4) No watermark
" ans
case $ans in
  1)  echo "Defaulting to bottom-left position."
      wmpos="80:H-h-50"
      wmstream3="[video][wm_scaled]overlay=$wmpos:shortest=1:format=auto[outv];"        
      ;;
  2)  echo
      echo "Positioning watermark at top-left."
      wmpos="80:50"
      wmstream3="[video][wm_scaled]overlay=$wmpos:shortest=1:format=auto[outv];"
      ;;
  3)  echo
      echo "Positioning watermark at top-right."
      wmpos="W-w-80:50"
      wmstream3="[video][wm_scaled]overlay=$wmpos:shortest=1:format=auto[outv];"
      ;;
  4)  echo
      echo "Disabling watermark."
      unset wmstream1
      unset wmstream2
      wmstream3="[tmp2]setsar=1[outv];"
      ;;
  *)  echo "WARNING: invalid option selected, defaulting to bottom-left position."
      wmpos="80:H-h-50"
      wmstream3="[video][wm_scaled]overlay=$wmpos:shortest=1:format=auto[outv];"
      ;;
  esac
  read -p "Start fade at custom time in first input? [y/N] " -n1 -r
  if [[ $REPLY =~ ^[Yy]$ ]]; then
    while [[ -z "$fadetime" ]]; do
    echo
    read -p "Enter custom start time in seconds: " fadetime
    echo "WARNING: using custom fade time of $fadetime seconds from first input.".
  done
  fi
  if [[ -z "$fadetime" ]]; then fadetime="$(echo "$length1" - "$fadeduration" | tr -d $'\r' | bc)" && 
    echo "Defaulting to adding fade -$fadeduration seconds from first input, at $fadetime seconds." 
  fi
  total="$(echo "$length1 + $length2 - $fadeduration" | tr -d $'\r' | bc)"
  ffmpeg -y $start_opt $end_opt -i "$1" -loop 1 -i "Watermark.png" \
  -movflags +faststart \
  $preset \
  -filter_complex \
  "color=black:16x16:d=$total[base];
  [0:v]fade=out:st=$fadetime:d=$fadeduration,setpts=PTS-STARTPTS[v0];
  $wmstream1
  [base][v0]scale2ref[base][v0];
  [base][v0]overlay,setsar=1[tmp];
  $wmstream2
  $wmstream3
  [0:a]afade=out:st=$fadetime:d=$fadeduration[0a];
  [0a]concat=n=1:v=0:a=1[outa]" \
  -map "[outv]" -map "[outa]" -c:v libx264 -crf 17 -c:a libopus -pix_fmt yuv420p "$2"
  unset fadetime
fi