ffmpeg -f concat -safe 0 -i concat.txt -map 0 -c copy output.mp4

file 'part1.mp4'
file 'part2.mp4'

ffmpeg.exe -ss 00:00:00.0 -i input.mp4 -t 00:12:58 -map 0 -vf scale=1280x544,setsar=1:1 -s 1280x544 output.mp4