Tiny BASH MPV Cut & Join Script - Bash does not read line correctly in my script - bash

Question

I have created a script that takes the filename of screenshots from MPV player and grabs the time codes and cuts the video.
I like MPV because it is very fast on big movie files and hitting s (screenshot) for every in and out cut is very easy. I have not found any bash script (I can only do bash or are learning bash) that can do this, only lua and java scripts.
The bash script:
#!/bin/bash
clear
DATE=$(date +"%Y%m%d_%H%M%S")
x-terminal-emulator -geometry 50x20+3100+0 -e "bash -c 'while true; do clear;ls *.jpg;sleep 1;done' &"
rm *.jpg CUT*.mp4 cutLines.* cutMerge.*
mpv --screenshot-template="~/%F-(%P)-%03n" "$1"
echo
read -p "--- Hit ENTER to CUT ---"
echo
ls *.jpg | cut -c 24-35 > cutLines.txt
IFS=$'\n'
while IFS= read -r ONE; do read -r TWO
echo " Making cut for duration: $ONE - $TWO stored as: CUT_${ONE}.mp4"
ffmpeg -nostdin -loglevel quiet -ss "${ONE}" -to "${TWO}" -i "${1}" -c copy CUT_"${ONE}".mp4
echo CUT_"${ONE}".mp4 >> cutMerge.tmp
done < cutLines.txt
cat cutMerge.tmp | sed "s/^/file '/" |sed "s/$/'/" > cutMerge.txt
ffmpeg -f concat -safe 0 -i cutMerge.txt -c copy CUTmerge_"$DATE".mp4
The script works for the clips.
Here is the link where you see what I struggle with.
It looks like read line does not read all the data or something?
Video showing what the problem is

Answer 1

Thanks to Ed Morton's TIPS the script is now working!
It looks like the problem was missing double quotes and the ffmpeg option -nostdin that was the main problem for this script.
#!/bin/bash
clear
rm *.jpg cutLines.txt cutMerge.txt cutMerge.tmp
DATE=$(date +"%Y%m%d_%H%M%S")
x-terminal-emulator -geometry 50x20+3100+0 -e "bash -c 'while true; do clear;ls *.jpg;sleep 1;done' &"
mpv --screenshot-template="~/%F-(%P)-%03n" "$1"
echo
read -p "--- Hit ENTER to CUT ---"
echo
ls *.jpg | cut -c 24-35 > cutLines.txt
IFS=$'\n'
while IFS= read -r ONE; do read -r TWO
echo " Making cut for duration: $ONE - $TWO stored as: CUT_${ONE}.mp4"
ffmpeg -nostdin -loglevel quiet -ss "${ONE}" -to "${TWO}" -i "${1}" -c copy CUT_"${ONE}".mp4
echo CUT_"${ONE}".mp4 >> cutMerge.tmp
done < cutLines.txt
cat cutMerge.tmp | sed "s/^/file '/" |sed "s/$/'/" > cutMerge.txt
ffmpeg -f concat -safe 0 -i cutMerge.txt -c copy VideoMerged_"$DATE".mp4
echo -e "\n--- cutLines"
cat cutLines.txt
echo -e "\n--- cutMerge\n"
cat cutMerge.txt
rm *.jpg cutLines.txt cutMerge.txt cutMerge.tmp
mpv VideoMerged_"$DATE".mp4