Takes .txt files in project root, finds raw video with same filename in `raw` subdir, and cuts videos according to data on each line in the .txt file.

01 ffmpeg_bulk_splitter.sh

#!/bin/sh

# for each text file, convert corresponding video
for FILE in *.txt; do

  # get movie file name
  FILE_NAME=${FILE%.*}

  # if movie exists
  if [ -a "raw/$FILE_NAME.mp4" ]; then

    # create output directory
    mkdir output/$FILE_NAME

    # start building ffmpeg command
    cmnd="ffmpeg -i raw/$FILE_NAME.mp4 "

    # for each line in text file
    while ((line_number++)); read START STOP NAME; do

      # replace spaces with underscores
      NEW_NAME=${NAME// /_}

      # append to ffmpeg command -> re-encoding each file so it will take longer (and a ton of cpu), but the precision is 1000 times better.
      cmnd=$cmnd"-ss $START -to $STOP -map 0 output/$FILE_NAME/$FILE_NAME$(printf %03d $line_number)-$NEW_NAME.mp4 "

    done < $FILE # end while read do

    # run created ffmpeg command
    $cmnd

    # append "_CONVERTED" to movie file
    mv raw/$FILE_NAME.mp4 raw/$FILE_NAME"_CONVERTED.mp4"

    # switch underscores back to spaces
    for CLIP in output/$FILE_NAME/*.mp4; do
      # get path
      DIR_NAME=$(dirname ${CLIP})
      # get CLIP name
      CLIP_NAME=$(basename $CLIP)
      # make new CLIP name with spaces for underscores
      NEW_NAME=${CLIP_NAME//_/ }
      # rename CLIP
      mv $CLIP "$DIR_NAME/$NEW_NAME"
    done

  else
    echo "---------------------------------------------------------------------------------"
    echo "*********************************************************************************"
    echo ""
    echo "raw/$FILE_NAME.mp4 does not exist!"
    echo "Make sure $FILE_NAME.mp4 is in the `raw` directory if you haven't already converted it."
    echo "Converted videos have `_CONVERTED` after their name."
    echo ""
    echo "*********************************************************************************"
    echo "---------------------------------------------------------------------------------"
  fi
done

02 readme.txt

# directory structure:

| ffmpeg_bulk_splitter.sh
| [file_name_1].txt
| [file_name_2].txt
| raw/
|-- [file_name_1].mp4
|-- [file_name_2].mp4

03 example text file.txt

00:00:01.1  00:00:02.1  Name of first 1-second clip
00:00:02.2  00:00:04.2  Name of second 2-second clip
00:00:00    00:00:00    DUMMY 

# script requires dummy line at end, not sure why

# avoid special characters in clip names!!!
# script will replace spaces with underscores then remove them after processing.
# script will not replace ! ? " ' / . etc. -> they can break this script.