Server Version#: lastes plex pass
Hi,
is there a way to optimise audio only ? I have several 4K/HDR files that I would like to optimise audio only (from atmos to 5.1 or even stereo).
I don’t want to conver the whole video track and lose quality and HDR.
So, It seems impossible or I missed something ?
thanks
Plex’s inbuilt optimize feature doesn’t do that.
You should be able to use https://www.xmedia-recode.de/en/ or similar ffmpeg frontends to do that.
Or use ffmpeg directly, if you are not shy of the command line.
thanks. So I suppose there is no way to do it directly in Plex (so with an automated process) ?
No. Why do you want it? Transcoding audio is not very demanding on cpu resources, so there should be generally no issue to do it on-the-fly during playback.
IDK why but with certain files , I have problems.
From what I found, when the file is :
On the Apple tv 4k, the audio is transcoded and I have a small delay. When the audio isn’t transcoded, it seems to be OK.
Note that I only have this problem on the ATV 4k with native Plex client. On the same ATV4k with Infuse, no problem. Same thing with android tv, works well.
Generally Audio is transcoded through the Native Plex app as long as you have the Direct Stream feature checked. So if you have a file with DTS 5.1 audio but your TV and stereo system cannot handle that, then it will transcode the audio only to what your system can handle and leave the video in tact.
You can learn more about this here: https://support.plex.tv/articles/200250387-streaming-media-direct-play-and-direct-stream/
Generally though if you want specific audio formats on your file, you should use 3rd party video/audio converting tools such as Handbrake. I use this when I want multiple audio versions on 1 video file, I then disable direct stream and enable direct play. This allows me to choose the audio file from the get-go and play the video and audio directly from my sever without any transcoding, see below:
You can then use the web app to choose your default audio file for that specific movie/show.
Hope this helps 
thanks !
I was just trying to be super lazy and have a one-click solution instead of going into the manual process 
Nice try!!! 
I’m sure in the future this will be a feature that’s added but probably on the lower end of the spectrum of feats that need to be added 
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