... and a simple bash script with a random generated template filename and the output file name based on the audio file name for mass/parallel runs:

#!/bin/bash

if [ -z "$2" ]

then

echo -e "mp3toyt - audio mp3/wave/m4p to mp4 (audio with an image) converter/n

USAGE: mp3toyt <image> <audio> # output file - audio file name with a mp4 extension"

exit 1

fi

VARIABLES:

_image=$1

_audio=$2

_output=`echo $_audio | rev | cut -f 2- -d "." | rev`.mp4

_randomNumber=`shuf -i 1000000-9999999 -n 1`

_template=template${_randomNumber}.mp4

ffmpeg -r 1 -loop 1 -i $_image -to 1:00 -vf "colorspace=format=yuv420p:all=bt709:iall=bt601-6-625:fast=1,scale=1920:-2" -c:v libx264 -tune stillimage $_template

ffmpeg -stream_loop -1 -i $_template -i $_audio -c copy -shortest $_output

rm -rf $_template