README.md

split-polywave.sh

Use case

I have a RØDECaster Pro, which records a multitrack file in the polyWAV format. It's kind of a pain to work with in editors, so I wrote this simple little ffmpeg script to split out the tracks easily.

Known issue

Probably needs to check to make ffmpeg is installed Doesn't retain chapter markers from the original file

split-polywav.sh

#!/bin/bash

if [ "$1" == 'help' ] || [ "$1" == '--help' ] || [ "$1" == '-help' ] || [ "$1" == '' ]; then
  echo 'Usage: split-polywav.sh [CHANNEL] [OUTPUT_FILENAME] [...FILES]'
  exit 0
fi

channel=$1
output_filename=$2
files=(${@:3})

declare -a output_files

for i in ${files[@]}; do
  echo "Processing $i..."
  output_files+=($output_filename-$channel-$i)
  ffmpeg -i $i -map_channel $channel $output_filename-$channel-$i

  echo "file '$output_filename-$channel-$i'" >> split-files.txt
done

extension="${files[0]##*.}"
ffmpeg -f concat -i split-files.txt -c copy $output_filename.$extension
echo ${output_files[@]}

function finish {
  rm split-files.txt
  for i in ${output_files[@]}; do rm $i; done
}
trap finish EXIT