remux .mkv into .mp4 (transcode audio to AAC) using ffmpeg, with progress indicator and time remaining

remuxx.sh

#!/bin/bash
PURPLE=$(tput setaf 13)
RED=$(tput setaf 1)
CYAN=$(tput setaf 14)
YELLOW=$(tput setaf 11)
GREEN=$(tput setaf 2)
NONE=$(tput sgr0)
ERASE="`tput cuu1``tput el`"
if [ -z "$1" ]; then 
	echo "Usage: $(basename $0) [source movie file]"
	exit 1
fi
if [ ! -f "$1" ]; then
        echo "${RED}ERROR: $1 : not found$NONE"
	exit 1
fi

FFMPEG=$(which ffmpeg 2>/dev/null)
if [ -z "$FFMPEG" ];  
	# for my thecus N5550 
	FFMPEG="/raid0/data/module/ffmpeg/sys/bin/ffmpeg"
	if [ ! -f "$FFMPEG" ]; then
		echo "$(RED) ffmpeg not found"
		exit 666;
	fi
fi

AUD=$("$FFMPEG" -i "$1" 2>&1 | sed -ne 's/^[ ]*Stream #0:\([0-9]*\).*: Audio: \([^\, ]*\), \(.*\)$/track="\1"; codec="\2"; etc="\3"/p')
VID=$("$FFMPEG" -i "$1" 2>&1 | sed -ne 's/^[ ]*Stream #0:\([0-9]*\).*: Video: \([^ (]*\)\(.*\)$/track="\1"; codec="\2"; etc="\3"/p')


TRANSCODE_AUDIO=0
if [ "$2" == "force_aac" ]; then
	TRANSCODE_AUDIO=1
fi

if [ $(echo "$VID" | wc -l) -gt 1 ]; then
	while read -r line; do	
		eval "$line"
		echo "video ${PURPLE}$track ${YELLOW}$codec ${NONE}$etc"ERASE 
	done <<< "$AUD"
	echo -n "--- Which ${PURPLE}video track${NONE} to use ? "; read VID_TRACK
	VID_CODEC=""	
	while read -r line; do	
		eval "$line"
		if [ "$track" == "$VID_TRACK" ]; then VID_CODEC="$codec"; break; fi
	done <<< "$VID"

else
	eval "$VID"
	VID_TRACK="$track"
	VID_CODEC="$codec"
fi

if [ -z "$VID_TRACK" -o -z "$VID_CODEC" ] ; then
	echo "ERROR : video track or codec not specfied, or wasn't parsed properly in ffmpeg output"
	exit 1
fi
if [ "$VID_CODEC" != "h264" ]; then
	echo "WARNING : non H.264 video stream; might not be playable on PS3"
fi

echo "--> will use video track ${CYAN}$VID_TRACK${NONE} encoded in ${CYAN}$VID_CODEC${NONE}"

if [ $(echo "$AUD" | wc -l) -gt 1 ]; then
	while read -r line; do	
		eval "$line"
		echo "audio ${PURPLE}$track ${YELLOW}$codec ${NONE}$etc"
	done <<< "$AUD"
	echo -n "--- Which ${PURPLE}audio track${NONE} to use ? "; read AUD_TRACK
	AUD_CODEC=""	
	while read -r line; do	
		eval "$line"
		if [ "$track" == "$AUD_TRACK" ]; then AUD_CODEC="$codec"; break; fi
	done <<< "$AUD"

else
	eval "$AUD"
	AUD_TRACK="$track"
	AUD_CODEC="$codec"
fi

PARAM_ACODEC="-c:a copy"
PARAM_AQUALITY=""

if [ -z "$AUD_TRACK" -o -z "$AUD_CODEC" ] ; then
	echo "ERROR : audio track or codec not specfied, or wasn't parsed properly in ffmpeg output"
	exit 1
fi

if [ "$AUD_CODEC" == "aac" -a $TRANSCODE_AUDIO -eq 0 ]; then
	echo "--> will copy audio track ${CYAN}$AUD_TRACK${NONE}"
else
	echo "--> will transcode audio track ${CYAN}$AUD_TRACK${NONE} using libfaac"
	PARAM_ACODEC="-c:a libfaac"
	PARAM_AQUALITY="-q:a 100"
fi

OUT="$1.output.mp4"
if [ -f "$OUT" ]; then
	echo -n "--> ${YELLOW}$OUT${NONE} already exists. Enter another name (Enter=delete existing) ? "
	read FN
	[[ -z "$FN" ]] && FN="$OUT"
	[[ -f "$FN" ]] && rm -f "$FN"
	OUT="$FN"
else
	echo "--> output file is : ${CYAN}$OUT${NONE}"
fi

DURA=$("$FFMPEG" -i "$1" 2>&1 | sed -ne 's/^.*Duration: \([0-9]*\):\([0-9]*\):\([0-9]*\)\.\([0-9]*\).*$/hr=\1; min=\2; sec=3; msec=4/gp')
if [ -z "$DURA" ] ; then
	"$FFMPEG" -i "$1" -c:v copy \
		$PARAM_ACODEC $PARAM_AQUALITY \
		-map 0:$VID_TRACK -map 0:$AUD_TRACK \
		"$OUT"
	exit 1
else
	eval "$DURA"
	hr=$(expr $hr + 0); min=$(expr $min + 0); sec=$(expr $sec + 0); msec=$(expr $msec + 0)
	((TOTAL_SEC = hr * 3600 + min * 60 + sec))
	echo "TOTAL $TOTAL_SEC sec"
	"$FFMPEG" -i "$1" -c:v copy \
		$PARAM_ACODEC $PARAM_AQUALITY \
		-map 0:$VID_TRACK -map 0:$AUD_TRACK \
		-loglevel debug \
		"$OUT" 2>/tmp/ffmpeg.out 1>/dev/null &
	PID=$!

	trap "kill $PID 2>/dev/null" EXIT
	TIME_START=$(date +%s)

	while kill -0 $PID 2> /dev/null; do	
		LAST_LINE=$(cat /tmp/ffmpeg.out | tail -n1)
		NOW=$(echo "$LAST_LINE" | sed -ne 's/.*time=\([0-9]*\):\([0-9]*\):\([0-9]*\)\.\([0-9]*\).*/hr=\1; min=\2; sec=\3; msec=\4/p')

		if [ ! -z "$NOW" ]; then
			eval "$NOW"
			hr=$(expr $hr + 0); min=$(expr $min + 0); sec=$(expr $sec + 0); msec=$(expr $msec + 0)
			((PROGRESS = hr * 3600 + min * 60 + sec))
			TIME_NOW=$(date +%s)
			((TIME_ELAPSED = TIME_NOW - TIME_START))
			((SPEED = PROGRESS / TIME_ELAPSED))
			((SEC_LEFT = (TOTAL_SEC - PROGRESS) / SPEED))
			MIN_LEFT=0
			if [ $SEC_LEFT -ge 60 ]; then
				((MIN_LEFT = SEC_LEFT / 60))
				((SEC_LEFT = SEC_LEFT % 60))
			fi
			TIME_LEFT=$(printf "%02d:%02d" $MIN_LEFT $SEC_LEFT)
			

			echo "$ERASE    progress: ${YELLOW}$PROGRESS${NONE}/$TOTAL_SEC, ETA ${YELLOW}$TIME_LEFT ${NONE}"
		else
			echo "$ERASE    progress: --"
		fi
		sleep 1
	done

	echo "${ERASE}${GREEN}Done${NONE}"
fi