path: root/roles/prerec/templates/remux.sh

#!/usr/bin/env bash
# {{ ansible_managed }}
# Mix in the normalized audio
# Usage: remux.sh $input_video_or_slug

with_suffix() {
    echo "$input_video" | sed "s/--\(main\|reencoded\|original\).webm\$/--$1/"
}

input_video="$1"
if [ ! -f $input_video ]; then
		# treat it as a slug
		input_video=$(get-file-prefix $1)--reencoded.webm
fi

input_audio="$(with_suffix "normalized.opus")"
output_video="$(with_suffix "final.webm")"
main_video="$(with_suffix "main.webm")"
main_subs="$(with_suffix "main.vtt")"

if cat $main_subs | head -1 | grep captioned; then
		$subs = "-i $main_subs"
fi

command="$(cat<<EOF
ffmpeg -y -i "$input_video" -i "$input_audio" $subs -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 "$output_video" &&
       cp "$output_video" "$main_video" &&
       if [[ -f "$main_subs" ]]; then touch -m "$main_subs"; fi
EOF
)"

printf "input: %s\ncomputed output: %s\nrelated main: %s\n\n" "$input_video" "$output_video" "$main_video"
printf "Produced incantation:\n%s\n\n" "$command"

if [ -z "$CONFIRMED" ]; then
		eval "$command"
else
		while true;
		do
				read -r -p "Run it?  y/n " -n 1 -r response
				if [[ $response =~ ^([yY])$ ]]; then
						eval "$command"
						exit 0
				else
						printf "\nExiting\n"
						exit 3
				fi
		done
fi