How do you create a crossfade transition between m

Question

I am currently looping MP4 videos with audio through FFMPEG. Here is the code

del intermediate1.ts
del f.txt
echo file intermediate1.ts>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt
echo file intermediate1.ts>>f.txt

ffmpeg -i "SHORT MUSIC.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts -nostdin
ffmpeg -f concat -i f.txt -c copy -bsf:a aac_adtstoasc "LONG MUSIC.mp4" -nostdin

However, the transition between each instance of the videos is not smooth. It cuts off as the next instance is shown. Would there be a way create a blend/crossfade transition for the videos?

I have come across this method however, it is only for 2 videos https://superuser.com/questions/778762/crossfade-between-2-videos-using-ffmpeg

Hope someone can help me! Thank you very much!!