CONVERT ALL MP3 FILES IN CURRENT DIRECTORY TO MP4 FILES WITH IMAGE AS BACKGROUND

convert_mp3_to_mp4.sh

#!/usr/bin/env bash

# CONVERT ALL MP3 FILES IN CURRENT DIRECTORY TO MP4 FILES WITH IMAGE AS BACKGROUND.
# See https://www.bannerbear.com/blog/how-to-convert-audio-to-video-for-youtube-upload-using-ffmpeg/#convert-mp3-to-mp4-with-an-image
# (Tested on MacOS)

ext=mp3
image=image.jpg

mkdir -p mp4 log
curr_dir=$(basename "$PWD")

echo "Converting all \"*.${ext}\" files to \"*.mp4\" ..."
echo "(Output prefix: \"${curr_dir} - \")"
echo

for f in *."${ext}"; do
  name=$(basename "${f}" .mp3)
  output="mp4/${curr_dir} - ${name}.mp4"
  log="log/${curr_dir} - ${name}.log"

  echo "Processing \"${f}\" ..."
  ffmpeg -loop 1 \
    -i "${image}" \
    -i "${f}" \
    -c:v libx264 \
    -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" \
    -shortest "${output}" \
      > "${log}" 2>&1 & # parallel
done

echo
echo "Waiting for all jobs to finish ..."
wait
echo
echo "Done!"
echo
echo "Output files are in \"mp4/\" directory:"
ls -b mp4