Transcoding with HDR Question

[en6ads]

Hi,

Can Jellyfin transcode a source with HDR (either static or dynamic metadata) to an output also with HDR? Put another way, does HDR survive the transcode and get included in the output? If so, is the outputted HDR static or dynamic? If input is dynamic (HDR10+ or DV), Will the output also be dynamic?

I've tried 3 different clients (Android with a HDR display, iOS iPad with HDR display, windows 11 Jellyfin Media Player output to a HDR display), and all the results look SDR to me. When transcoding, I'm going from a source of 60 - 100mbps to an output of 28mbps (cellular). I use an Intel A310 with quick sync enabled, with tone mapping disabled (I don't want the server to tone map, I want the client display to do that), with AV1 and HEVC hardware enabled.

Many thanks.

[nyanmisaka]

Currently all transcoding targets SDR. If using direct-playback or direct-streaming, HDR is preserved. Note that hardware encoders (for example QSV) also generally do not support carrying dynamic HDR metadata (HDR10+/DoVi), usually only static HDR10/HLG.

Currently our Jellyfin-FFmpeg part for HDR10/HDR10+/HLG/DoVi to HDR10 transcoding is in place. After completing the transcoder refactor, Jellyfin will allow users to choose to transcode from HDR to HDR (with reduced resolution/bitrate).

[en6ads]

Currently our Jellyfin-FFmpeg part for HDR10/HDR10+/HLG/DoVi to HDR10 transcoding is in place. After completing the transcoder refactor, Jellyfin will allow users to choose to transcode from HDR to HDR (with reduced resolution/bitrate).

Thank you. Exciting news on the refactor work. Is the target release for this v10.11 or later to 10.12 or so?

Many thanks.

[nyanmisaka]

It's on the roadmap but has no ETA, as the people here are volunteers doing free work in their spare time.

But it's definitely not in 10.11, as it's a big enough database refactor.

[askyentist]

Hello!
I'm also excited by the news that this might be available sometime in the future, though I understand that a timeline can't be assigned to it. I was wondering though if there was a GitHub issue or Project tracker that one could subscribe to to potentially be updated when progress was made?
Thanks!

[Titan365]

Hi,

@nyanmisaka

The 12.0 release notes mention FFmpeg 8.1 and a spec-compliant dvh1 HLS variant for Dolby Vision Profile 5, but I cannot find an option for HDR-to-HDR transcoding.

I tested Jellyfin 12.0 RC with the official Android TV client. When transcoding is required because of a reduced resolution/bitrate or subtitle burn-in, Jellyfin still generates an HDR-to-SDR pipeline.

There is also an existing feature request covering this use case:

https://features.jellyfin.org/posts/1694...ranscoding

Earlier discussion there mentioned that an encoder capability probe was a prerequisite. Has that prerequisite or the related transcoder refactor been completed as part of Jellyfin 12.0?

Is it correct that HDR10/HDR10+/HLG/DoVi-to-HDR10 transcoding has not yet been integrated into Jellyfin 12.0? If so, is there now a GitHub issue, pull request or project tracker that we can follow?

I am particularly interested in Intel QSV transcoding to static HDR10, including subtitle burn-in.

Thank you!

[TheDreadPirate]

AFAIK, JF12 does not yet transcode HDR to HDR. Not because ffmpeg can't, but because Jellyfin does not construct a ffmpeg command to perform that action.

@nyanmisaka - Correct me if I'm wrong, but the hold up for HDR-to-HDR transcoding was detecting some HDR types in a reliable manner?

[nyanmisaka]

I replied here https://old.reddit.com/r/jellyfin/commen..._hdrtohdr/