merge-scenes.sh

#!/bin/bash
# concatenate videos given start and end filenames
# https://trac.ffmpeg.org/wiki/Concatenate
# expect naming convention from achesco's split-to-scenes.sh:
# https://gist.github.com/achesco/4dc2ebf13378a0a61fc26c7fe01f539e
# leading 4 digits from $1 and $2

begin=${1:0:4}
end=${2:0:4}

# compare tails of 1st and 2nd argument as a sanity check that filenames are homogenous
tail1=${1:4}
tail2=${2:4}

if [ "$tail1" != "$tail2" ]
then
	echo 'filenames after leading 4 digits not equal. halting.'
	exit 1
fi

printf "file '%04d$tail1'\n" $(eval echo {$begin..$end}) > list.txt

echo "Ready to concatenate the following files:"
cat list.txt
echo ""
read -p "Press any key to continue, or ctrl-C to cancel"

ffmpeg -f concat -i list.txt -c copy $begin-$end$tail1