Rename-Videos.ps1

$ErrorActionPreference = 'Stop'

foreach ($file in ($args | ForEach-Object { Get-Item $_ } | Sort-Object -Property FullName)) {
    if ($file.Name -match '\A\d{8}-\d{6}-') {
        # Already renamed (Skip)
        continue
    }

    $timeOptions = if ($file.Name.ToUpper().StartsWith("GX")) {
        # GoPro (Shift time zone)
        @('-GlobalTimeShift', '-9')
    }
    else {
        # Default
        @()
    }

    $argFile = New-TemporaryFile # Create an argfile to handle Unicode filename correctly.
    try {
        Out-File -Encoding UTF8 -FilePath $argFile.FullName -InputObject $file.FullName
        exiftool.exe -api largefilesupport=1 '-FileName<CreateDate' -charset FileName=UTF8 -d '%Y%m%d-%H%M%S-%%f.%%e' -api QuickTimeUTC @timeOptions -@ $argFile.FullName
    }
    finally {
        Remove-Item $argFile.FullName
    }
}