First go to directory with your videos and create list:

printf "file '%s'\n" ./*.MOV > list.txt

Next join all videos and speed them up using filter “setpts=0.01*PTS”

ffmpeg -f concat -i list.txt -preset ultrafast -filter:v "setpts=0.01*PTS" -c:a copy -nostdin -an /tmp/final.mp4

https://youtu.be/lcYdN4J4tJQ

https://www.youtube.com/watch?v=aBwt15fpDag

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