Extract last frame from video

Add-Type -AssemblyName System.Windows.Forms

$form = New-Object System.Windows.Forms.Form
$form.Text = "Drop a Video File Here"
$form.Width = 400
$form.Height = 400
$form.AllowDrop = $true

# Add a label with instructions
$label = New-Object System.Windows.Forms.Label
$label.Text = "Drag and drop a video file here to extract its last frame"
$label.AutoSize = $true
$label.Location = New-Object System.Drawing.Point(20, 80)
$form.Controls.Add($label)

# Get the script directory more reliably
$scriptDir = if ($PSScriptRoot) {
    $PSScriptRoot
} elseif ($psISE) {
    Split-Path -Parent $psISE.CurrentFile.FullPath
} else {
    $PWD.Path
}

# DragEnter event handler
$form.Add_DragEnter({
    $_.Effect = if ($_.Data.GetDataPresent([Windows.Forms.DataFormats]::FileDrop)) {
        [Windows.Forms.DragDropEffects]::Copy
    } else {
        [Windows.Forms.DragDropEffects]::None
    }
})

# DragDrop event handler
$form.Add_DragDrop({
    $files = $_.Data.GetData([Windows.Forms.DataFormats]::FileDrop)
    foreach ($file in $files) {
        $folder = Split-Path $file
        $baseName = [System.IO.Path]::GetFileNameWithoutExtension($file)
        $outputFile = Join-Path $folder "$($baseName)-lastframe.jpg"

        # Use the previously defined scriptDir
        $ffmpegPath = Join-Path $scriptDir "ffmpeg.exe"

        if (-not (Test-Path $ffmpegPath)) {
            [System.Windows.Forms.MessageBox]::Show("ffmpeg.exe not found at:`n$ffmpegPath`n`nPlease ensure it's in the same folder as the script.", "Error", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Error)
            return
        }

        try {
            $process = Start-Process -FilePath $ffmpegPath -ArgumentList "-y", "-sseof", "-1", "-i", "`"$file`"", "-vframes", "1", "-q:v", "2", "`"$outputFile`"" -NoNewWindow -Wait -PassThru

            if ($process.ExitCode -eq 0) {
                [System.Windows.Forms.MessageBox]::Show("Last frame extracted successfully to:`n$outputFile", "Success", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Information)
            } else {
                [System.Windows.Forms.MessageBox]::Show("Failed to extract frame. FFmpeg error code: $($process.ExitCode)", "Error", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Error)
            }
        }
        catch {
            [System.Windows.Forms.MessageBox]::Show("Error processing file: $_", "Error", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Error)
        }
    }
})

[System.Windows.Forms.Application]::EnableVisualStyles()
$form.ShowDialog()