Playback dim when display color space set to Rec. ITU-R BT.2020-1

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
30/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
c, macos
Domain
computer-graphics

Research direction

Begin by reproducing the reported dim playback with the provided mpv command, macOS display profiles, and Apple sample stream. Inspect the attached output.txt and compare behavior with the default, Rec. ITU-R BT.2020-1, and Rec. ITU-R BT.709-5 profiles. Done means HDR playback is no longer extremely dark under the affected profiles and remains comparable to QuickTime Player.

Written by the indexing model from the issue text.

Description

os:mac
mpv Information
mpv v0.39.0-170-g37159a8ee0 Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Oct 20 2024 00:54:23
libplacebo version: v7.349.0 (v7.349.0-18-g9e16c86f)
FFmpeg version: n7.1
FFmpeg library versions:
   libavcodec      61.19.100
   libavdevice     61.3.100
   libavfilter     10.4.100
   libavformat     61.7.100
   libavutil       59.39.100
   libswresample   5.3.100
   libswscale      8.3.100
Other Information
- macOS version: macOS 15.0 (24A335)
- Source of mpv: My own build of master using mpv-build
- Introduced in version: Unknown
Reproduction Steps

On a Mac that supports Extended Dynamic Range and is running macOS Sequoia:

  • Download a copy of the Apple Advanced stream
    H.264/HEVC/UHD/Dolby Vision/Dolby Digital/Dolby Atmos example from here.
  • Under the  menu click on System Settings…
  • In the System Settings panel click on Displays
  • Change the Color profile setting to be Rec. ITU-R BT.2020-1
  • Run mpv like so:
    mpv --no-config --autofit=50% --pause --script-opts-append=osc-visibility=always --start=1:16 --target-colorspace-hint --tone-mapping=auto --target-peak=500 --vo=gpu-next ~/Movies/Advanced\ stream\ H.264:HEVC:UHD:Dolby\ Vision:Dolby\ Digital:Dolby\ Atmos.mp4
  • Notice the picture is extremely dark
Expected Behavior

With the Color profile of the display to Rec. ITU-R BT.2020-1 the video looks somewhat similar how it looks when played with the Quicktime Player.

Actual Behavior

With the Color profile of the display to Rec. ITU-R BT.2020-1 the video is so dark that it is hard make out what is being shown. This screenshot shows mpv on top and the Quicktime Player below:
Profile-changed

With the Color profile changed back to the default:
Profile-default

This also happens with the Color profile set to Rec. ITU-R BT.709-5. With other Color profile settings this does not occur.

For the screenshots mpv was run like so:

mpv/build/mpv --no-config --gpu-debug --log-file=output.txt --autofit=50% --pause --script-opts-append=osc-visibility=always --start=1:16 --target-colorspace-hint --tone-mapping=auto --target-peak=500 --vo=gpu-next ~/Movies/Advanced\ stream\ H.264\:HEVC\:UHD\:Dolby\ Vision\:Dolby\ Digital\:Dolby\ Atmos.mp4

This was reported against IINA in issue https://github.com/iina/iina/issues/5218

Log File

output.txt

Sample Files

I downloaded a copy of the Apple Advanced stream example "H.264/HEVC/UHD/Dolby Vision/Dolby Digital/Dolby Atmos streaming" from here.

Media info: 
low-batt@urp Movies$ mediainfo Advanced\ stream\ H.264\:HEVC\:UHD\:Dolby\ Vision\:Dolby\ Digital\:Dolby\ Atmos.mp4 
General
Complete name                            : Advanced stream H.264:HEVC:UHD:Dolby Vision:Dolby Digital:Dolby Atmos.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/dby1/iso2/mp41)
File size                                : 291 MiB
Duration                                 : 1 min 38 s
Overall bit rate                         : 24.7 Mb/s
Frame rate                               : 23.976 FPS
Writing application                      : Lavf61.1.100

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5@High
HDR format                               : SMPTE ST 2094 App 4, Version 1, HDR10+ Profile B compatible
Codec ID                                 : hvc1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 1 min 38 s
Source duration                          : 1 min 38 s
Bit rate                                 : 23.0 Mb/s
Maximum bit rate                         : 24.0 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.116
Stream size                              : 270 MiB (93%)
Source stream size                       : 281 MiB (97%)
Title                                    : Core Media Video
Language                                 : English
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : BT.2020
Mastering display luminance              : min: 0.0050 cd/m2, max: 1000 cd/m2
Maximum Content Light Level              : 1375 cd/m2
Maximum Frame-Average Light Level        : 188 cd/m2
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : E-AC-3 JOC
Format/Info                              : Enhanced AC-3 with Joint Object Coding
Commercial name                          : Dolby Digital Plus with Dolby Atmos
Codec ID                                 : ec-3
Duration                                 : 1 min 38 s
Bit rate mode                            : Constant
Bit rate                                 : 768 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Compression mode                         : Lossy
Stream size                              : 9.01 MiB (3%)
Title                                    : Core Media Audio
Service kind                             : Complete Main
Default                                  : Yes
Alternate group                          : 1
Complexity index                         : Not present / 16
Number of dynamic objects                : 15
Bed channel count                        : 1 channel
Bed channel configuration                : LFE
Dialog Normalization                     : -27 dB
compr                                    : -0.28 dB
dialnorm_Average                         : -27 dB
dialnorm_Minimum                         : -27 dB
dialnorm_Maximum                         : -27 dB


low-batt@urp Movies$
I carefully read all instruction and confirm that I did the following:
  • I tested with the latest mpv version to validate that the issue is not already fixed.
  • I provided all required information including system and mpv version.
  • I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
  • I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
  • I attached the full, untruncated log file.
  • I attached the backtrace in the case of a crash.
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