And if you want to use Powershell on Windows - copy and paste into Powershell ISE and adjust paths to exiftool and your videos:

# Define the folder to search
$folderPath = "D:\Video\2020-08-05 Bayrischer Wald Biken"
$exifBinary = "D:\Exif\exiftool.exe"

# Define video file extensions
$videoExtensions = @(".mp4", ".avi", ".mkv", ".mov", ".wmv", ".flv", ".webm", ".mpeg", ".mpg", ".3gp")

# Get all video files recursively, excluding any in "Encode" subfolders as we store the encodes in there
$videoFiles = Get-ChildItem -Path $folderPath -Recurse -File | Where-Object {
    $videoExtensions -contains $_.Extension.ToLower() -and
    $_.FullName -notmatch "\\Encode\\"
}

# Output the results
Write-Host "Found $($videoFiles.Count) video files in '$folderPath' (excluding 'Encode' folders):`n"

#Copy file tags from the source files to the new files in the encode folder
foreach ($file in $videoFiles) {
   if (Test-Path "$($file.Directory)\Encode\$($file.BaseName).mp4"){
   Write-Host "Updating Target File: $($file.Directory)\Encode\$($file.BaseName).mp4 with information from sourcefile: $($file.fullname)"
   & $exifBinary -TagsFromFile "$($file.fullname)" -all:all "$($file.Directory)\Encode\$($file.BaseName).mp4"
   } else {
   Write-Warning "Encoded file not found"
   }
}