#!/bin/sh

set -e

filename=${1:-}
audioname=$(printf "$filename" | sed "s/\(.*\).vtt/\1/")

outdir=$(dirname "$filename")/utterances
mkdir -p "$outdir"

# given vtt what is original ext?
ffmpeg_commands=$(grep "\-->" $filename | awk -F " " \
    -v aname="$audioname" \
    -v outdir="$outdir" \
    '{print "ffmpeg -i "aname" -ss " $1 " -to " $3 \
    " -metadata text_source=" aname ".vtt" \
    " -vn -acodec copy " outdir "/" $1"_"$3 ".ogg"}')

while read cline;
do
    echo $cline && sleep 1;
done <<< $ffmpeg_commands