Generate video with title screen

titlevid.sh

#!/bin/bash -e
#
# Titlevid
#
# Utility wrapper to prepend any video with a fade in
# from black and a title screen
#
# version:      0.1
# created:      08/06/2021
# last update:  08/06/2021
# author:       Jack + Joe
#
# CHANGELOG
#
# 0.1 (08/06/2021)
# Initial version

TITLE=""
TMP_DIR="/tmp"
DURATION=5
V=8

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

usage() {
  cat <<-EOF
Usage: titlevid [OPTIONS]

Options:
  -i                      Path to input file
  -o                      Path to output file
  -V                      Verbose output, takes ffmpeg numbers (default 8)
                          8 = quiet
                          16 = error
                          24 = warning
                          32 = full info
                          40 = debug
  -t, --title  string     Text on the title screen (max 15 chars!)
  -d, --duration integer  Duration of the intro sequence (default 5)
  -h, --help              This screen
  -v, --version           Show the version

EOF
return;
}

while [[ $# -gt 0 ]]
do
  key="$1"
  case $key in
    -h|--help)
      usage
      exit
      ;;
    -i|--input)
      INPUT="$2"
      shift # past argument
      shift # past value
      ;;
    -V)
      V="$2"
      shift # past argument
      shift # past value
      ;;
    -o|--output)
      OUTPUT="$2"
      shift # past argument
      shift # past value
      ;;
    -v|--version)
      echo "titlevid version 0.1, build June 8 2021"
      exit
      ;;
    -d|--duration)
      DURATION="$2"
      shift # past argument
      shift # past value
      ;;
    -t|--title)
      TITLE="$2"
      shift # past argument
      shift # past value
      ;;
    *)
      COMMAND+=("$1")
      # shift # past value
      # shift # past value
      shift
      ;;
  esac
done

if [ -z "$INPUT" ] || [ -z "$OUTPUT" ]
then
  usage
  exit
else
  filename_ext=$(basename -- "$INPUT")
  extension="${filename_ext##*.}"
  filename="${filename_ext%.*}"
  SIZE=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 $INPUT)
  FPS=$(ffprobe -v error -select_streams v:0 -show_entries stream=r_frame_rate -of csv=s=x:p=0 $INPUT)
  FPS=$(echo $FPS | bc -l)

  # generate title
  echo "==> Generating title"
  ffmpeg -y -v $V  -f lavfi -i color=size=${SIZE}:duration=$DURATION:rate=$FPS:color=black -vf "drawtext=fontfile=/System/Library/Fonts/SFNS.ttf:fontsize=30:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:text='${TITLE}'" -frames:v 1 /tmp/title.png

  echo "==> Concat title with video... (demuxing, this can take a while)"
  ffmpeg -y -v $V -loop 1 -framerate $FPS -t $DURATION -i /tmp/title.png -t $DURATION -f lavfi -i aevalsrc=0 -i $INPUT -filter_complex '[0:0] [1:0] [2:0] [2:1] concat=n=2:v=1:a=1' /tmp/concat.mp4

  # fade in
  echo "==> Fade in video... (this can take a while)"
  ffmpeg -y -v $V -i /tmp/concat.mp4 -vf "fade=t=in:st=0:d=3" -c:a copy $OUTPUT
  
  echo "Done! You can find your video at: $OUTPUT"
  rm /tmp/concat.mp4 /tmp/title.png
fi

Usage:

./titlevid -t "Slam dunk, da funk?" -i ~/Downloads/testvid.mp4 -o ~/Desktop/testing.mp4

testing.mp4