GoPro.ps1

$directory = "E:\DCIM\100GOPRO"

$rootFiles = Get-ChildItem -Path $directory -Filter "GOPR*.MP4" | Sort-Object
$suffixes = $rootFiles | ForEach-Object { $_.BaseName.Substring($_.BaseName.Length - 4) }
$groups = $suffixes | ForEach-Object { 
  $suffix = $_
  $group = Get-ChildItem -Path $directory -Filter "*$suffix*.MP4" | Sort-Object
  [PSCustomObject]@{
    Suffix = $suffix
    Group  = $group
  }
}

foreach ($group in $groups) {
  $inputFileList = New-TemporaryFile
  $group.Group | ForEach-Object { "file '$($_.FullName)'" } | Out-File -FilePath $inputFileList
  
  # Create a temporary file based on the date and time of the video
  $outputFileName = $group.Group[0].CreationTime.ToString("yyyyMMdd_HHmmss") + ".mp4"
  $outputFile = Join-Path -Path $env:TEMP -ChildPath $outputFileName

  ffmpeg -hwaccel auto -f concat -safe 0 -i $inputFileList -c copy -y $outputFile -progress -
  Remove-Item -Path $inputFileList
}