[Bug] Plex transcodes video when it should only transcode audio

Server Version#: 1.23.4.4775
Player Version#: latest

I’ve noticed for a while that Plex seems to transcode video unnecessarily when attempting to play back files with a TrueHD track. There isn’t an issue for files with other audio codecs eg. AC3, DTS (all flavours)

I even have some media that has a TrueHD track and an AC3 compatibility track; that transcode video if the TrueHD track is selected vs the AC3 track.

This wasn’t an issue some time ago, so it’s clearly a bug. If the client can play the video track there shouldn’t be a need to transcode it simply due to audio.

This also doesn’t seem to be a new issue given this older thread from last year.

This is particularly grating on my specific content that has UHD HEVC video along with a TrueHD (5.1,7.1 w/wo ATMOS). My server struggles to handle the transcode so it would be great to see this one fixed.

I can supply whatever logs are necessary and possibly sample files but this should be pretty easy to replicate.

Looks similar to another report: Audio transcoding causing video transcoding

Plex client version?
Client device - Shield, FireStick 4K, etc?.

I believe i have the same issue.

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