ffmpeg -y -ss 0 -i http://foo/bar/bas.mov -t 20 -ss 20 -i http://foo/bar/bas.mov -t 20 -ss 40 -i http://foo/bar/bas.mov -t 20 -ss 60 -i http://foo/bar/bas.mov -t 20 -ss 80 -i http://foo/bar/bas.mov -t 20 -filter_complex "[0][1][2][3][4]concat=n=5:v=1[outv]" -map "[outv]" -pix_fmt yuv420p -c:v libx264 -preset superfast s3-concat.mp4