Loop photo over MP3 file for specified time

script.sh

#!/bin/bash

# get audio, image, and output files
audio_file=`yad --file . --title "Select MP3 file:"`
image_file=`yad --file . --title "Select image file:"`
output_file=`yad --file . --save --title "Output file name:"`
hours_loop=`yad --entry --numeric --title "Hours to Loop:"`
minutes_loop=`yad --entry --numeric --title "Minutes to Loop:"`
seconds_loop=`yad --entry --numeric --title "Seconds to Loop:"`

# Get total loop time (duration of video)
total_loop=`expr $hours_loop \* 3600 + $minutes_loop \* 60 + $seconds_loop`

# Clean up after ourselves
tmp=tmp-`date +%s`
mkdir -p $tmp
cd $tmp

# process and encode the video with the libx265 for size
ffmpeg -loop 1 -i $image_file -i $audio_file -c:v libx265 -c:a aac -strict experimental -b:a 192k -shortest tempoutput.mp4
ffmpeg -i tempoutput.mp4 -c copy temp.mkv
ffmpeg -stream_loop -1 -t $total_loop -i temp.mkv -t $total_loop -c copy $output_file

cd ..
echo "Done... Deleting temporary files and directories..."
rm -r $tmp

echo "Finished."
echo $output_file