Convert midi files to instrument backed video

midi-to-audio-backed-mp4.sh

#!/bin/bash

TARGET_MIDI_FILE="bk_cove.mid"
STATIC_COVER_IMAGE="${HOME}/Downloads/bk_cover_image.jpg"

# open midi file in Logic Pro
open "$TARGET_MIDI_FILE"

# use `osascript` to bounce the project, converting midi tracks to an audio file
osascript \
    -e 'tell application "Logic Pro" to activate' \
    -e 'tell application "System Events" to keystroke "b" using command down' \
    -e 'tell application "System Events" to keystroke return' \
    -e 'delay 1' \
    -e 'tell application "System Events" to keystroke "'"$TARGET_MIDI_FILE"'"' \
    -e 'delay 1' \
    -e 'tell application "System Events" to keystroke return'

# create an `mp4` with a static cover image and an `m4a` backing track
ffmpeg \
    -i "${TARGET_MIDI_FILE}.m4a" \
    -loop 1 \
    -i "$STATIC_COVER_IMAGE" \
    -c:v libx264 \
    -c:a copy \
    -shortest \
    -t 120 \
    "${TARGET_MIDI_FILE}.mp4"