p2webm

#!/bin/bash

height=""

if [[ -z "$1" ]]; then
    echo "picture height music length start"
    exit
fi

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

if [[ -n "$5" ]]; then
    start_time="-ss $3"
else
    start_time="-ss 0:00";
fi

if [[ -n "$4" ]]; then
    length="-t $4"
else
    length="";
fi

if [[ "${1##*.}" == "gif" ]]; then
    ffmpeg -ignore_loop 0 $start_time $length -i "$1" -i "$3" -map 0:v -map 1:a -acodec libvorbis -vcodec libvpx -b:v 200K -b:a 144k -pix_fmt yuv420p -shortest -metadata title="$3" "$3".webm
    exit
fi

ffmpeg -r 1 -loop 1 $start_time $length -i "$1" -i "$3" -map 0:v -map 1:a -acodec libvorbis -vcodec libvpx -b:v 0 -crf 16 -g 360 $height -pix_fmt yuv422p10le -shortest -metadata title="$3" "$3".webm

exit