SOLVED: Long delays when trying to play 48k 24bit audio, but only on the desktop Media Player

[pv407]

Thank you both for the responses!

Backing up.  There's FLAC in a M4A container?!  It looks like JMP is locally remuxing the file?  In JMP can you click on your icon in the top right, click on Playback (NOT the one in Dashboard), scroll to the bottom and check "Always remux FLAC audio files"?  I think that should trigger a server side remux, which should be quicker.

You could also manually remux the file so that the FLAC audio is in a FLAC container instead of M4A.

Unfortunately changing that setting didn't do the trick.

But it is indeed the .m4a container that is the culprit. The same file in a .flac plays instantly.

Your m4a is not "web optimized" so that the demuxer of mpv is trying to read all the way to the end of the file to get the metadata. I suggest you to use ffmpeg to remux it again with -movflags +faststart to optimize it, which should make it load faster.

Thanks for this, but I may as well just go through and turn them into proper .flac files as they should be.

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I'll mark this as solved, though I still wonder why the Android app and in-browser Jellyfin handle this with no issue, while the desktop app struggles?

Either way, thanks again for the help!