mpv_webm_v02

#!/bin/bash

start_time=""
length=""
amap=""
output_path=""
height=""
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 subs [audio [output [height]]]\n"
    exit
fi

rm -f /tmp/working_video
ln -s "`pwd`/$1" /tmp/working_video

#audio
if [[ -n "$3" ]]; then
    if [[  "$3" == "no" ]]; then
        amap="-an"
    else
        internal_alang=$(echo "$3" | sed s/[^0-9]//g)
        let "selected_alang=$internal_alang-1"
        amap="-map 0:a:$selected_alang"
    fi
else
    amap="-map 0:a:0";
    #amap="";
fi

#output
if [[ -n "$4" ]]; then
    output_path="$4"
else
    output_path="$HOME";
fi

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

if [ -f /tmp/webm_end ]; then
    length_var=$(echo "`cat /tmp/webm_end` - $start_time_var" | bc);
    length="-t $length_var";
else
    length="";
fi
if [[ -n "$2" && "$2" != "no" ]]; then #with subs
    if [[ -n "$5" ]]; then
        height=";[v]scale=trunc(oh*a/2)*2:$5[v]"
    fi
    slang=`echo "$2" | awk -F ' ' '{print $2}'`
    if [[ ${slang} == "unknown" ]]; then
        external_subs=`echo "$2" | sed 's/.*\(\"[^)()].*\"\).*/\1/g'`
        rm -f /tmp/working_subs
        ln -s "`pwd`/`echo ${external_subs%?} | cut -c 2-`" /tmp/working_subs
        subs="-filter_complex [0:v:0]subtitles=/tmp/working_subs[v]$height -map [v]"
    else
        internal_subs=`echo "$2" | sed s/[^0-9]//g`
        let "selected_subs=$internal_subs-1"
        subs="-filter_complex [0:v:0]subtitles=/tmp/working_video:si=$selected_subs[v]$height -map [v]"
    fi
    ffmpeg -i "$1" $start_time $subs $amap $param $length -async 1 $output_path/"$1 s $start_time_var l $length_var".webm
else #without subs
    if [[ -n "$5" ]]; then
        height="-vf scale=trunc(oh*a/2)*2:$5"
    fi
    subs="-sn -map 0:v:0";
    ffmpeg $start_time $length -i "$1" $subs $amap $param $height -async 1 $output_path/"$1 s $start_time_var l $length_var".webm
fi

rm -f /tmp/working_video
rm -f /tmp/working_subs

sleep 1
exit