mass transcode MKVs keeping english subtitles

mass_transcode.ps1

<#

Automates the handbrake CLI (such as it exists) so I can sic this script on a
whole dir of mkvs and have them trimmed down, but with subtitles

The raw command that works:

  flatpak run --command=HandBrakeCLI fr.handbrake.ghb `
  --input '../The Good Place S02E04.mkv' `
  --output 'The Good Place S0204.mkv' `
  --multi-pass `
  --turbo `
  --subtitle-lang-list "eng `
  --all-subtitles `
  --subname "english `
  --encoder x264 

#>

$jfin_root = '/media/jellyfin/media/videos/Shows'
$out_root = '/media/legacy/media/videos/Shows'

$big_mkvs = get-childitem -path $jfin_root -Recurse *.mkv | where-object {$_.Length -gt .8GB}

foreach ($mkv in $big_mkvs) {
  $in_file = $mkv.FullName
  $dest_folder = $mkv.DirectoryName.replace($jfin_root, $out_root)
  $out_file = join-path -path $dest_folder -childpath $mkv.name

  if (test-path $dest_folder) {
    write-host 'path already exists'
  } else {
    write-host "no such path as $dest_folder--creating it"
    new-item -path $dest_folder -type Directory
  }

  write-host "About to encode '${in_file}' to '${out_file}'"

  flatpak run --command=HandBrakeCLI fr.handbrake.ghb `
  --input $in_file `
  --output $out_file `
  --multi-pass `
  --turbo `
  --subtitle-lang-list "eng" `
  --all-subtitles `
  --subname "english" `
  --encoder x264 

}