#!/bin/bash -e

if ! ffmpeg -version | head -n1
then
	echo Missing ffmpeg
	exit 1
fi

if ! test -f "$1"
then
	echo Missing RAW file to encode to MP4
	exit
fi

input="$1"

eval $(ffprobe -v 0 -of flat=s=_ -show_format "$input") # neat trick to get video variables into shell
eval $(ffprobe -v 0 -of flat=s=_ -show_streams "$input")

if test "$format_tags_creation_time" # try get date from video's metadata
then
	today=$(echo $format_tags_creation_time | awk '{print $1}' | cut -c-10)
fi

output=~/Documents/$(date +%Y-%m-%d)/$(basename "${input%.*}").mp4

if test -f "${output}"
then
	echo 🎥 ${output} already exists
	exit
fi

mkdir -p "$(dirname $output)" &>/dev/null || true

if ! FFREPORT=file=/tmp/htmlvideo.log:level=32 ffmpeg -y -i "${input}" -movflags +faststart -pix_fmt yuv420p -c:v libx264 -acodec aac "${output}" &> /dev/null
then
	rm -f "${output}"
	echo Error encoding "${input}", see /tmp/htmlvideo.log for details
	exit 1
fi

test "$format_duration" && printf "🎥 Duration: %.1f seconds\n" $format_duration

function size {
	echo $(du -h "${1}" | tr '\n\t' ' ')
}

echo -n "🎥 Input: $(size "${input}") Output: $(size "${output}")"
# Space savings https://en.wikipedia.org/wiki/Data_compression_ratio
printf " Space savings: %.0f%%\n" $(bc <<< "scale=2; (1 - $(wc -c < "${output}") / $(wc -c < "${input}") ) * 100")