ffmpeg_concat

ffmpeg -f concat -safe 0 -r 1/4 -i file_mp4 -f mp4 $(date +%Y%m%d)_output_$(date +%H%M%S).mp4
cat file_mp4
file 'a0.jpg'
file 'a1.jpg'
file 'a2.jpg'
file 'a3.jpg'
file 'a4.jpg'
file 'a5.jpg'
file 'a6.jpg'
ffmpeg -f concat -safe 0 -i file_mp3 -c copy $(date +%Y%m%d)_output_$(date +%H%M%S).mp3
cat file_mp3
file 'ff_capture.mp3'
file 'ff_capture.mp3'