Add arbitrary tags to converted file

[Goose]

Your can write a post custom command to insert tags. Here’s an example.

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

Use PostCustomCommand to do this at the end of the conversion. See MCEBuddy - Advanced Settings, Commands and Tweaking