#!/usr/bin/env sh
set -e

input="$1"
output="$2"
EXT="m4a"

if [ -z "$AAX_ACTIVATION_BYTES" ]; then
  echo "set AAX_ACTIVATION_BYTES env var"
  exit 1
fi

ffmpeg -activation_bytes "$AAX_ACTIVATION_BYTES" -threads 0 -i "$input" -vn "$output.$EXT"