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ffmpeg issue

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

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