Update: I’ve set the track order correctly using Mkvtoolnix - Plex still defaults to the “highest quality” audio stream that matches the default language.
Example:
- I put a movie on my server.
- The movie file includes two audio tracks: a 5.1 AC-3 track and 7.1 TrueHD Atmos track.
- I use FFMPEG to downmix the 5.1 track into a 2.0 Stereo AAC track with metadata tags marking it as the default track.
- In mkvtoolnix, I add the new Stereo track and set the track order to have the new 2.0 AAC track as the first audio track, with the “Default” flag set to Yes.
- I include the 5.1 and 7.1 tracks as the 2nd and 3rd audio tracks, and set their default flags to No.
- On playback, the Plex client automatically selects the 7.1 TrueHD track, causing Transcoding, unless the user manually selects the first audio track, which is the Stereo AAC track.
This seems to fly counter to Plex’s guidance that the client player will select the first audio track (in track order) that matches the user’s default language; the client is defaulting to the third audio track in this case.
There is no way to change this default. It is very frustrating. Please help.
