Create a movie from a collection of image files

GenerateMovie.sh

#!/usr/bin/env bash
# 
# Gerenate mp4 videos from a collection of image files
#
# Video files are saved into ./videos
#

# Folder with image files:
src="/home/datawork-lops-oh/somovar/WP1/data/dashboard/img/monthly" # This is an example

list_files_for_movie (){
    # Create a text file with the list of image file to use in a video
    ls $src/*.png | sort -V | xargs -I {} echo "file '{}'" > list.txt
}

list_specific_files_for_movie (){
    # Create a text file with the list of image file to use in a video
	# Use a specific file pattern:
    ls $src/*_map.png | sort -V | xargs -I {} echo "file '{}'" > list.txt
}

create_video (){
	# Usage:
	# create_video <frame_rate> <short_name_to_file_list_maker_function>

    echo "Generating a video from images ($2)..."
    # List image files:
    case $2 in
        "All")
            list_files_for_movie
            ;;
        "Specific")
            list_specific_files_for_movie
            ;;
    esac
    # Create video:
    # ffmpeg options:
    # -v loglevel         set logging level
    # -y                  overwrite output files
    # -r rate             set frame rate (Hz value, fraction or abbreviation)
    # -f fmt              force format
    # -safe 0
    # -i infile
    ffmpeg -hide_banner -loglevel error -y -r $1 -f concat -safe 0 -i list.txt -vsync vfr -b:v 18M -vf "fps=50,format=yuv420p" videos/animation_$2.mp4
    # Now compress the video:
    ffmpeg -hide_banner -loglevel error -y -i videos/animation_$2.mp4 -crf 18 videos/animation_$2_compressed.mp4
}

echo "######################### Updating videos ..."
create_video 6 "All" 
create_video 8 "Specific" 
echo "######################### Done"