ffmpeg pipes for render without saving

ffmpegPipeIO

#I think it might be possible to do this all in a single shell by using single ampersand (&) at end of each command

#make two pipes
mkfifo /tmp/pipe1 /tmp/pipe2

#send input1 to pipe1
ffmpeg -y -i input1.mp4 -c copy -f nut /tmp/pipe1

#open a new shell window/tab
#send input2 to pipe2
ffmpeg -y -i input2.mp4 -c copy -f nut /tmp/pipe2

#open a new shell window/tab
#combine pipes into single file
ffmpeg -y -i /tmp/pipe1 -i /tmp/pipe2 -filter_complex concat=n=2:v=1 both.mov