mpv_crop_v02

#!/bin/bash

height=""
length=""
start_time=""
amap=""
crop1=""
crop2=""
param="-vcodec libvpx -qmin 20 -qmax 30 -acodec libvorbis -b:v 1M -b:a 128k -crf 30 -cpu-used 2 -threads 2"

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

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

if [[ -n `ls /tmp/webm_crop1` ]]; then
    crop1=`cat /tmp/webm_crop1`
else
    crop1="0:0";
fi

x1="${crop1%:*}"
y1="${crop1#*:}"

if [[ -n `ls /tmp/webm_crop2` ]]; then
    crop2=`cat /tmp/webm_crop2`
    x2="${crop2%:*}"
    y2="${crop2#*:}"
    w=$(echo "$x2 - $x1" | bc)
    h=$(echo "$y2 - $y1" | bc)
else
    w="100"
    h="100"
fi

ffmpeg $start_time $length -i "$1" -map 0:v:0 $amap -vf "crop=$w:$h:$crop1" $height $param -sn $output_path/"$1 s $start_time_var l $length_var cropped w$w h$h".webm
sleep 1
exit