photoprism/photoprism

Videos: Transcode HDR10+ to SDR

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#3,295 opened on Mar 18, 2023

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Description

Describe what problem this solves and why this would be valuable to many users

Modern phone cameras can record video in HDR10+ and Dolby Vision. These videos (at least the HDR10+ ones I can test) look grey and washed out when viewed in Photoprism.

Describe the solution you'd like

It would be great if HDR10+ and Dolby Vision videos were converted to SDR as part of the transcoding process so that they can be viewed in a web browser properly.

Additional context

The video on the left is a normal SDR video recorded on the same phone (Xiaomi 12 Pro) as the video on the right which is HDR10+ The colours on the left look vibrant and 'normal' whereas the colours in the video on the right are washed out.

image

I'm unable to test Dolby Vision but I imagine the results are similar.

Contributor guide

Research direction
Investigate Photoprism's existing transcoding code (e.g., in `internal/ffmpeg/`) and add support for HDR to SDR conversion using FFmpeg filters like `tonemap` and `zscale`. Look at how HDR metadata is detected and then apply the conversion for HDR10+ and Dolby Vision sources.
Tech stack
go
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoFFmpegVideo encoding concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40