Jellyfin DLNA reports m4a audio files as video/quicktime

[Mike S]

I have installed Jellyfin 10.9.11 & the DLNA plugin 3.0.0.0 on a new Linux box running EndeavourOS/Arch Linux. My audio files are mainly MP3 or M4A CD rips, and they are in a Music library in Jellyfin. Jellyfin clients play them fine. But I also use a DLNA client on my phone (Hifi Cast) which plays to some wifi speakers. This will play the MP3 files only, and rejects the M4A files saying they have mime type "video/quicktime" which can't be played on the speakers. The strange thing is that the old version of Jellyfin server worked fine (I think it was 10.8, but I'm not sure). I think that if Jellyfin's DLNA plugin said they were audio/mp4 or audio/aac, I think they would probably work.

Any suggestions? Please don't tell me to transcode the M4A files to MP3 - that would take days!