cut-video-segment

#!/usr/bin/env bash

inputFile="$1"
printf "Start time: "
read -r fromTime
printf "End time: "
read -r toTime

filename="$(basename -- "$inputFile")"
extension="${filename##*.}"
filename="${filename%.*}"
dir_name="$(dirname "$inputFile")"

partNo="$(find "$dir_name/" -maxdepth 1 -name "$filename.*.mp4" | rev | cut -d '.' -f-2 | rev | cut -d '.' -f1 | sort -rn | head -n1)"
if [[ -z "$partNo" ]]; then
    partNo="0"
fi
partNo="$((partNo + 1))"

tmpFilename="$filename.$partNo.tmp.$extension"
newFilename="$filename.$partNo.mp4"

ffmpeg -y -i "$inputFile" -async 20 -ss "$fromTime" -to "$toTime" "$tmpFilename"
cut_filter="$(ffmpeg -i "$tmpFilename" -vf cropdetect -f null - 2>&1 | awk '/crop/ { print $NF }' | sort | uniq -c | sort -nr | rev | cut -d' ' -f1 | rev | head -n1)"
ffmpeg -y -i "$tmpFilename" -vf "$cut_filter" -map_metadata -1 "$newFilename"
rm -f "$tmpFilename"