video-split.sh

#!/bin/bash

if [ -z "$2" ]
then
    echo "Generate script that cuts longvideos into shorter clips."
    echo "- Useful for converting old recordings into video-clips."
    echo
    echo "Usage: $0 CUTS OUTSCRIPT" 
    echo "CUTS - File describing what to do."
    echo "OUTSCRIPT - Name of the script to generate."
    echo
    echo "The CUTS file must have the following format:"
    echo "begin"
    echo "inputfile1.mp4"
    echo "START STOP CLIPNAME1.mp4"
    echo "START STOP CLIPNAME2.mp4"
    echo "START STOP CLIPNAMEn.mp4"
    echo "end"
    echo 
    echo "There can be as many clips per input files as needed."
    echo "There can be as many inputfiles as needed, one per begin/end block."
    echo "The START and STOP times are of format HH:MM:SS.MS"
    echo 
    echo "Example file:"
    echo "begin"
    echo "tape1.mp4"
    echo "00:00:00.00 00:12:45.00 dusteds_12th_bithday.mp4" 
    echo "00:12.45.10 00:20:00.00 xmas-1998.mp4" 
    echo "00:21 00:30:54.00 skitrip-1999.mp4" 
    echo "end"
    echo
    echo "begin"
    echo "tape2.mp4"
    echo "00:01:00.00 00:20:30.00 dusteds_13th_bithday.mp4" 
    echo "00:20.35.00 00:30:00.00 xmas-2000.mp4" 
    echo "end"
    echo
    echo "This script will output the lines of the cuts file as it reads them."
    echo
    exit 1
fi


CUTS="$1"
SCRIPT="$2"

if [ -x "$SCRIPT" ]
then
    echo "Error, output script '$SCRIPT' already exist, will not overwrite."
    exit 1
fi

STATE="lfb" # looking for begin

function lfb {
    if [ "$1" == "begin" ]
    then
        STATE="rfn"
        echo "begin"
    fi
}

SOURCE_FILE=""
function rfn {
    SOURCE_FILE="$1"
    STATE="rcl"
    echo "$SOURCE_FILE"
}

NUMCMDS=0
function rcl {
    LINE=`echo "$1" | tr -s " "`
    if [ "$LINE" == "end" ]
    then
        STATE="lfb"
        echo "end"
        echo
    else
        START_TIME=`echo $LINE | cut -d ' ' -f 1`
        STOP_TIME=`echo $LINE | cut -d ' ' -f 2`
        DEST_FILE=`echo $LINE | cut -d ' ' -f 3`
        echo "$START_TIME $STOP_TIME $DEST_FILE"
        CMD="ffmpeg -ss $START_TIME -i \"$SOURCE_FILE\" -c copy -to $STOP_TIME $DEST_FILE"
        echo "$CMD" >> "$SCRIPT"
        ((NUMCMDS++))
    fi
}

while IFS= read -r LINE
do
  case $STATE in
      ("lfb") lfb "$LINE" ;;
      ("rfn") rfn "$LINE" ;;
      ("rcl") rcl "$LINE" ;;
  esac
done < "$CUTS"

echo "Wrote $NUMCMDS lines to $SCRIPT"