mpv_mp4cut_v02

#!/bin/bash

height=""
length=""
start_time=""
aparam=""

if [[ -z "$1" ]]; then
    printf "usage: video [audio [output [height]]]\n"
    exit
fi

#audio
if [[ -n "$2" ]]; then
    if [[  "$2" == "no" ]]; then
        aparam="-an"
    else
        internal_alang=$(echo "$2" | sed s/[^0-9]//g)
        let "selected_alang=$internal_alang-1"
        aparam="-map 0:v:0 -map 0:a:$selected_alang -acodec copy"
    fi
else
    aparam="-acodec copy"
fi

#output
if [[ -n "$3" ]]; then
    output_path="$3"
else
    output_path="$HOME";
fi

#height
if [[ -n "$4" ]]; then
    height="-vf scale=trunc(oh*a/2)*2:$4"
else
    height=""
fi

if [[ -n `ls /tmp/webm_start` ]]; then
    start_time_var=`cat /tmp/webm_start`
    start_time="-ss $start_time_var"
else
    start_time="-ss 0";
fi

if [[ -n `ls /tmp/webm_end` ]]; then
    length_var=$(echo "`cat /tmp/webm_end` - $start_time_var" | bc)
    length="-t $length_var"
else
    length=""
fi

ffmpeg $start_time $length -i "$1" -vcodec copy $aparam -f mp4 $height -sn -cpu-used 2 -threads 2 $output_path/"$1 s $start_time_var l $length_var".mp4
sleep 1
exit