Helper script for joining (concatenating) multiple media files together using ffmpeg without using an intermediate text file

ffjoin

#!/usr/bin/env bash

if [  $# -lt 2 ]; then
  echo "Usage: ffjoin <joined> <file>..."
  exit 1
fi

output=$1
shift

if [ -f "$output" ]; then
  echo "Output file '$output' already exists"
  exit 1
fi

for path in "$@"; do
  if [ ! -f "$path" ]; then
    echo "Cannot find file '$path'"
    exit 1
  fi
done

(
  for path in "$@"; do
    echo "file '$path'"
  done
) | ffmpeg -f concat -protocol_whitelist 'file,pipe' -i - -c copy "$output"