Labeling of Audio Tracks

[Tony_T]

I decided to label the commentary tracks on some of my media. Well, I’m able to do this successfully, For MKV files plex will show the track labels, but I’m unable to get Plex to recognize the labels in MP4 files.:

Anything I’m doing wrong here?

MKV:
Plex:

ffprobe:
Stream #0:5(eng): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (comment)

Metadata:

  title           : Commentary: Francis Ford Coppola

  HANDLER_NAME    : Commentary: Francis Ford Coppola

  DURATION        : 03:22:06.37300

MP4 files, on the other hand…..

ffprobe:
Stream #0:4[0x5](eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 320 kb/s (comment)

Metadata:

  handler_name    : Commentary: Terry Gilliam and producer Charles Roven

  vendor_id       : \[0\]\[0\]\[0\]\[0\]

Side data:

  audio service type: main

[MovieFan]

AFAIK, mp4 doesn’t support the title field for audio tracks so there is nothing for Plex to read. I’ve heard other players will use another field to get around this issue, but Plex doesn’t do that.