extract_frames_from_videos.sh

#!/usr/bin/env bash

while read -rep "Enter input path location: " in_dir; do
    if [ -d "${in_dir}" ]; then
         echo "${in_dir} already exists - please enter a valid directory path."
    else
        break
    fi
done

eval cd "$in_dir"

while read -rep "Enter output path location: " out_dir; do
    if [ -d "${out_dir}" ]; then
         echo "${out_dir} already exists - please enter a valid directory path."
    else
        break
    fi
done

videos=( $(find . -name "*.MOV" -print | sort) )

for video in "${videos[@]}"
do
    mkdir -p "${out_dir}/${video##*/}"
done

printf '%s\n' "${videos[@]}" | parallel -j 8 "ffmpeg -i {} -qscale:v 5 -vsync 0  -hide_banner -loglevel panic ${out_dir}/{/}/%d.jpg && echo {} done "