Bash script to generate proxies from videos and audios.

proxies.sh

#!/bin/bash
# helpful resource: http://macilatthefront.blogspot.com/2018/12/tutorial-using-ffmpeg-for-dnxhddnxhr.html

# Usage:
# proxies.sh -t audio -t video -s ./media-path -p ./proxy-path

quality="lb"
codec="dnxhr"
suffix_video="${SUFFIX_VIDEO:-mxf}"
suffix_audio="wav"
width=""
proxy_path="./proxy"
media_path="./media"

input_file=""
output_file=""

units=4
CONVERT_VIDEO=0
CONVERT_AUDIO=0
DRY=0

cmd_ffmpeg="ffmpeg -loglevel warning -hwaccel auto -y -noautorotate"
	# 

cmd_params_video="\
	$PARAMS_FFMPEG \
	-g 1 \
	"
	# -sn -an \ disable subtitles and audio

# -vf colormatrix=bt601:bt709 \

function show_help {
	echo "Usage: [env_variables] ./proxies.sh [options]"
	echo ""
	echo "Environment variables:"
	echo "SUFFIX_VIDEO=mxf"
	echo "PARAMS_FFMPEG=extra ffmpeg params"
	echo ""
	echo "Options:"
	echo "-d dry -- run without actual processing"
	echo "-i single media input to convert"
	echo "-o output file if using -i option"
	echo "-s ./media-source-folder -- default=$media_path"
	echo "-p ./proxy-folder -- default=$proxy_path"
	echo "-t audio|video -- select what type of media to process, can be repeated, default=none"
	echo "-c codec dnxhr|h264_nvenc -- default=$codec"
	echo "-w width to scale -- default=-1 (-1 no scaling)"
	echo "-q lb|sq|hq -- quality for proxies, default=$quality"
	echo "-u max units, how many videos/units can be processed at the same time -- default=$units"
	echo ""
}

OPTIND=1 
while getopts "ds:p:t:q:c:w:u:i:o:h": opt; do
	case "$opt" in
	h|\?)
		show_help
		exit 0
		;;
	d)
		DRY=1
		;;
	t)
		[[ "$OPTARG" == "video" ]] && CONVERT_VIDEO=1
		[[ "$OPTARG" == "audio" ]] && CONVERT_AUDIO=1
		;;
	q)
		quality="$OPTARG"
		;;
	c)
		codec="$OPTARG"
		;;
	w)
		width="$OPTARG"
		cmd_params_video="$cmd_params_video -vf scale=$width:-1"
		;;
	s)
		media_path="$OPTARG"
		;;
	p)
		proxy_path="$OPTARG"
		;;
	i)
		input_file="$OPTARG"
		;;
	o)
		output_file="$OPTARG"
		;;
	u)
		units="$OPTARG"
		;;
	esac
done
if [ $OPTIND -eq 1 ]; then
	echo "No options were passed."
	show_help
	exit 0
fi

params=( "$@" )

function convertVideoCmd {
	mkdir -p ${proxy_path}
	filepath=$1
	filename=$(basename $filepath)
	outpath=$2
	if [[ -z "$outpath" ]]; then
		outpath="${proxy_path}/${filename%.*}-proxy-${codec}_${quality}_${width}.${suffix_video}"
	fi

	if [[ -f "$outpath" ]]; then
		# echo "Skipping $filepath; proxy exists."
		echo ""
		exit 0
	fi

	cmd="$cmd_ffmpeg -i $filepath"
	if [[ "$codec" == "h264_nvenc" ]]; then
		cmd="$cmd -c:v h264_nvenc -preset fast -pix_fmt yuv420p"
		if [[ "$quality" == "lb" ]]; then cmd="$cmd -qp 12";
		elif [[ "$quality" == "sq" ]]; then cmd="$cmd -qp 24";
		fi
	else
		cmd="$cmd -c:v dnxhd -profile:v dnxhr_$quality -pix_fmt yuv422p"
	fi
	cmd="$cmd $cmd_params_video -c:a pcm_s16le $outpath"

	echo "$cmd"
}

function convertAudio {
	echo "  converting $filepath"
	mkdir -p ${proxy_path}
	filepath=$1
	filename=$(basename $filepath)
	echo "ffmpeg -i $filepath -c:a pcm_s16le ${proxy_path}/${filename%.*}-proxy.${suffix_audio}"
}

if [[ -f "$input_file" ]]; then
	echo "Converting $input_file"
	cmd="$(convertVideoCmd "$input_file" "$output_file")"
	echo -e "$cmd"
	if [[ $DRY == 0 ]]; then
		echo -e "$cmd" |xargs --verbose --max-procs="$units" -I CMD bash -c CMD
	fi
	wait
	echo "done."
fi

if [[ $CONVERT_VIDEO == 1 ]]; then
	echo "Converting videos..."
	cmds=""
	for file in ${media_path}/*.{MOV,mov,mkv,mp4}; do
		echo "$file"
		if [[ -f "$file" ]]; then
			cmds="$cmds\n$(convertVideoCmd "$file")"
		fi
	done

	echo -e "$cmds"
	if [[ $DRY == 0 ]]; then
		echo -e "$cmds" |xargs --verbose --max-procs="$units" -I CMD bash -c CMD
	fi
	wait

	echo "done."
fi

if [[ $CONVERT_AUDIO == 1 ]]; then
	echo "Converting audio..."
	cmds=""
	for file in ${media_path}/*.{aac,mp3,wav,flac}; do
		cmds="$cmds\n$(convertAudio "$file")"
	done

	echo -e "$cmds"
	if [[ $DRY == 0 ]]; then
		echo -e "$cmds" |xargs --verbose --max-procs="$units" -I CMD bash -c CMD
	fi
	wait

	echo "done."
fi