How To Fix: Plex Shows 'Unknown' For Audio and/or Subtitle Tracks

Thanks to @robtheone for this script to add a language code to MP4 files for Plex:

CustomCommandPath=mp4box\mp4box.exe
CustomCommandParameters="%convertedfile%" -lang 1=eng -lang 2=eng
CustomCommandHangPeriod=100
CustomCommandCritical=true
CustomCommandUISession=false
CustomCommandShowWindow=false
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