Introzapper - Remove intros from videos without a full re-encode. Note by default only 24 seconds can be removed. (License: MIT License)

introzapper.sh

#!/bin/bash
#[file] [-d detectOnly]

alias ffmpeg="ffmpeg -nostdin"

function shortenVideo {
    #[file] [shorten-by] [-d do nothing]
    if [[ "$3" == "-d" ]]
    then
        return
    fi

    temp=$RANDOM$RANDOM
    ffmpeg -v error -y -ss 24 -i "$1" -c copy "$temp-f2.ts"
    f2len=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$temp-f2.ts")
    olen=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$1")
    len=$(echo "$olen - $f2len" | bc)
    ffmpeg -v error -y -i "$1" -ss "$2" -to "$len" -c:a copy -c:v libx264 -crf 22 -preset ultrafast "$temp-f1.ts"
    ffmpeg -v error -y -i "concat:$temp-f1.ts|$temp-f2.ts" -c copy -movflags +faststart "$temp-f3.mp4"
    rm "$temp-f1.ts" "$temp-f2.ts"
    nlen=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$temp-f3.mp4")
    if [[ "$(echo "$nlen - $olen + $2 + 5" | bc | sed 's/\..*//g')" -gt "0" ]]
    then
        mv "$temp-f3.mp4" "$1"
    else
        rm "$temp-f3.mp4"
        echo "Encode for $1 failed!"
        return 1
    fi
}

function detectImage {
    #[image-file] [template-file]
    temp=$RANDOM$RANDOM
    cf=$(compare -verbose -metric MSE "$1" "$2" $temp-diff.png 2>&1 | grep 'all:' | sed 's/.*: \([0-9]*\).*/\1/g')
    rm $temp-diff.png 2>/dev/null
    if [[ "$cf" -lt 75 && "$cf" != "" ]]
    then
        return 0
    else
        return 1
    fi
}

temp2=$RANDOM$RANDOM

ffmpeg -v error -ss 2 -i "$1" -vframes 1 -q:v 2 -y ss-$temp2.jpg
mogrify -resize 1280x720\! ss-$temp2.jpg

if detectImage ss-$temp2.jpg /home/vtemplates/example1.jpg
then
    echo "Detected example1 Intro"
    shortenVideo "$1" 6.5 "$2"
elif detectImage ss-$temp2.jpg /home/vtemplates/example2.jpg
then
    echo "Detected example2 Intro"
    shortenVideo "$1" 7 "$2"
fi

rm ss-$temp2.jpg