ffmpeg -i "../8.01x/01/MIT801XXT313-G010100_100.mp4" ^ -i "../8.01x/01/MIT801XXT313-G010200_100.mp4" ^ -i "../8.01x/01/MIT801XXT313-G010300_100.mp4" ^ -filter_complex "[0:v]crop=960,scale=640:480,setpts= PTS -STARTPTS[v0]; [v0][0:a][1:v][1:a][2:v][2:a]concat=n=3:v=1:a=1[v][a]" -map "[v]" -map "[a]" output.mp4 from: ffmpeg support forum