Trim-DashcamVideos.ps1

<#
.DESCRIPTION
Splits and re-encodes MP4 videos (yuv240p) based on the specified parameters 

.PARAMETER File
The file to process

.PARAMETER Start
The start (in seconds or minute.seconds or minute:seconds format)

.PARAMETER End
The end time (in seconds or minute.seconds or minute:seconds format)

.PARAMETER FFmpegPath
The path to ffmpeg
#>

param(
    [Parameter(Mandatory=$true)]
    [string]$File,
    
    [Parameter(Mandatory=$true)]
    [string]$Start,

    [Parameter(Mandatory=$true)]
    [string]$End)

$FFmpegPath = "C:\Users\gusgr\Desktop\Programs\ffmpeg\bin\ffmpeg.exe"

$startParts = $Start.Split(@('.', ':'))
$endParts = $End.Split(@('.', ':'))

$startSeconds = 0
$startMinutes = 0
$endSeconds = 0
$endMinutes = 0

if ($startParts.Length -gt 1) {
    $startMinutes = [int]::Parse($startParts[0])
    $startSeconds = [int]::Parse($startParts[1])
} else {
    $startSeconds = [int]::Parse($Start)
}

if ($endParts.Length -gt 1) {
    $endMinutes = [int]::Parse($endParts[0])
    $endSeconds = [int]::Parse($endParts[1])
} else {
    $endSeconds = [int]::Parse($End)
}

$difference = ($endMinutes*60 + $endSeconds) - ($startMinutes*60 + $startSeconds)
$differenceMinutes = 0
while ($difference -ge 60)
{
	$difference = $difference - 60
	$differenceMinutes = $differenceMinutes + 1
}

$outputFilename = "$([IO.Path]::GetDirectoryName($file))\$([IO.Path]::GetFileNameWithoutExtension($file))-cut.mp4"
& $FFmpegPath -ss 00:0$($startMinutes):$startSeconds -i $File -to 00:0$($differenceMinutes):$difference -pix_fmt yuv420p -an $outputFilename