#!/bin/bash

# Check if a parameter is provided
if [ -z "$1" ]; then
    echo "Usage: "$(basename $0)" <files>"
    exit 1
fi

TMPFILE=$(mktemp)

for input in "$@";
do
    if [ -f "$input" ]; then
        if [ "$container" == "" ]; then
            container="${input##*.}"
        fi
        if [ "$container" != "${input##*.}" ]; then
            echo "Files need to be in same format to merge!"
            echo "Abandoning merge"
            if [ -f "$TMPFILE" ]; then
                rm $TMPFILE
            fi
            echo;read -rsn1 -p "Press any key to continue . . .";echo
            exit
        fi
        echo "file '$input'" >> $TMPFILE
        container="${input##*.}"
        filename=${input%.*}
    fi
done

output="$filename.mergedprogress.$container"
sort -n -o $TMPFILE"_sort" $TMPFILE

echo "The following files will be merged in this order:"
cat $TMPFILE"_sort"
echo;read -rsn1 -p "Press any key to continue . . .";echo

cmd='ffmpeg -f concat -safe 0 -i "'"$TMPFILE"'_sort" -c copy "'"$output"'"'
eval $cmd
if [ $? -eq 0 ];
then
    actualheight=$(ffprobe -v error -select_streams v -show_entries stream=height -of csv=p=0:s=x "$output")
    #output2="${output%.*}."$actualheight"p.$container"
    output2="${output//.mergedprogress./.$actualheight""p.merged.}"
    mv "$output" "$output2"
    echo "Output file: $output2"
    rm $TMPFILE
    rm $TMPFILE"_sort"
else
    echo "An error occured. File not converted properly!"
    echo "Full ffmpeg command:"
    echo "$cmd"
fi

echo;read -rsn1 -p "Press any key to continue . . .";echo