Zsolt <dqeswn <at> gmail.com> writes: > ffmpeg -i motor1.avi -i motor2.avi -i motor3.avi > -c copy -filter_complex > '[0:0] [0:1] [1:0] [1:1] [2:0] [2:1] concat I did not test but I think space is a delimiter, try '[0:0][0:1][1:0][1:1][2:0][2:1]concat... Carl Eugen