ffmpeg -f concat -i <(for f in /Калуга/*.MP4; do echo "file '$f'"; done) -qscale:v 0 -filter:v "setpts=0.075*PTS" all.avi
ffmpeg -f concat -i <(for f in /home/ftp/unsorted/Калуга/*.MP4; do echo "file '$f'"; done) -qscale:v 0 -filter:v "setpts=0.075*PTS" -an all.avi
ffmpeg -i all.mp3 -f concat -i <(for f in /d/z/100VIDEO/*.MP4; do echo "file '$f'"; done) -strict -2 -shortest -qscale:v 0 -qscale:a 0 -filter:v "setpts=0.075*PTS" all.mp4