$filename = 'INPUT.avi'
ffmpeg.exe -i $filename -f ffmetadata FFMETADATAFILE.txt

$table = Import-Csv .\chapters.csv -Delimiter ';'
$table | ForEach-Object {
    $time = $_.endtime -split ':'
    $end = [int](New-TimeSpan -Hours $time[0] -Minutes $time[1] -Seconds $time[2]).TotalMilliseconds

    if (!$start) {
        $start = '00:00:35' -split ':'
        $start = [int](New-TimeSpan -Hours $start[0] -Minutes $start[1] -Seconds $start[2]).TotalMilliseconds
    }
$chapter = @"

[CHAPTER]
TIMEBASE=1/1000
START=$start
END=$end
title=$($_.title)

"@
    $start = $end

    $chapter | Out-File -FilePath FFMETADATAFILE.txt -Append -NoNewline

}

ffmpeg.exe -i $filename -i FFMETADATAFILE.txt -map_metadata 1 -codec copy OUTPUT.mp4