Hello,
I’m a little confused, due to not having hdr transcoding with nvidia on windows I have the hdr transcoding disabled as it kills performance having software transcoding.
So before when I tried Hdr content ( transcoding) on my TV it would look washed out. That’s fine that’s expected behaviour.
I’ve just tired today and even transcoding down to 8mbps I’m seeing Hdr being activated in the corner of my TV and the colours are definitely hdr.
Has something changed on plex?
Open the Dashboard on Plex Web and verify that it’s actually transcoding. There can be files in HEVC/HDR which use less than 8mbps.
Yes it’s 100% transcoding.
It’s a 64mbps hdr file , transcoding down to 8mbps,
Verified it is 8mbps as the ethernet adapter shows it around 8-10mbps.
I have hdr tone mapping disabled. But hdr is activating on my TV.
Even this image says sdr? But whys it then triggering hdr??
Sorry, I don’t know what’s going on.
It leaves me with a dilemma,
If I turn on HDR to sdr transcoding, the people with HDR tvs who transcode from my server won’t get HDR.
If I turn it off People with sdr displays get washed out colours.
Very confused on how this is supposed to work
My setup is a bit different, but, I think I’m seeing the same or similar issue.
My plex server is a fedora machine. My tv is a 4k HDR (10) tv. All of my 4k hdr movies get transcoded when trying to watch them on my tv. The odd part is that the plex client is putting the tv into HDR mode, which begs the question (which I think the OP was asking): Why is it transcoding in the first place if the client knows it’s on an HDR tv and it’s displaying the content in HDR mode?
I’ve actually gone down this rabbit hole for similar reasons as the OP: I actually can’t watch 4k HDR movies via plex because the processing required to transcode on the server is so great that it causes the movie to pause every 5-10 seconds while the server catches up. (all the cores on the server are pegged).
If I disable video stream transcoding, playing a 4k HDR movie simply results in a message that says “Error Unable to play media”.
Any help would be much appreciated!
-Joe
With Plex, all transcoded video is H.264, 8-bit SDR.
The Enable HDR Tonemapping setting in Settings → Transcoder applies only when Plex is transcoding video.
If you enable HDR Tonemapping, when transcoding HDR video, Plex will map HDR colors to SDR color.
If HDR Tonemapping is disabled, when transcoding HDR videos, the output will have washed out colors.
The only way people with HDR TVs receive HDR video is if Plex is direct playing the video. If Plex is transcoding the video, they will receive SDR video.
Edit: I’m not sure why your TV is showing HDR. I’m not seeing that on my LG B7 OLED. However, the output will be SDR video.
Late addition but I tried transcoding via the plex web UI and the individual TS snippets are in color space BT2020 with PQ transfer function (HDR, not SDR). However it doesn’t seem to passthrough the HDR static metadata at all (so I assume its being mapped to the 0, 10000 nits range (which isn’t super usable), not sure how player behaves without the metadata?)
So it seems like transcoding does passthrough HDR (which is seperate from doing the tonemapping, but its nice as it allows you to transcode files while still maintaining HDR).
Though it would be nice if we could get the metadata aspect clarified.
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