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MediaSPIP Simple : futur thème graphique par défaut ?
26 septembre 2013, par
Mis à jour : Octobre 2013
Langue : français
Type : Video
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Sur d’autres sites (7173)
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Merge commit ’cd8f772d0678a90957f4dfd5ce51af9d22e3f212’
4 novembre 2013, par Michael NiedermayerMerge commit ’cd8f772d0678a90957f4dfd5ce51af9d22e3f212’
* commit ’cd8f772d0678a90957f4dfd5ce51af9d22e3f212’ :
lavc : Add colorimetry values for BT.2020, other non-included onesConflicts :
doc/APIchanges
libavcodec/avcodec.h
libavcodec/version.hMerged-by : Michael Niedermayer <michaelni@gmx.at>
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pgssubdec : fix subpicture output colorspace and range
24 avril 2016, par Jan Ekströmpgssubdec : fix subpicture output colorspace and range
Functionality used before didn’t widen the values from limited to
full range. Additionally, now the decoder uses BT.709 where it
should be used according to the video resolution.Default for not yet set colorimetry is BT.709 due to most observed
HDMV content being HD.BT.709 coefficients were gathered from the first two parts of BT.709
to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2).
They were additionally confirmed by manually calculating values.Fixes #4637
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Transcoding HEVC 4K HDR using ffmpeg and vaapi
13 mai 2021, par P. BrandI am trying to transcode a 4K HEVC HDR video to a lower bitrate using ffmpeg and VAAPI hardware acceleration for my LG OLED television.



I use the following file :
Video



Using the following command :



ffmpeg -init_hw_device vaapi=va:/dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device va -filter_hw_device va -i LG\ 4K\ HDR\ Demo\ -\ Daylight.mkv -map 0:0 -t 00:00:20 -c:v hevc_vaapi -sei hdr -qp:v 21 lg_vaapi.mkv




But this file is not recognized as HDR on my TV.



When using the libx265 encoder (which is off course much slower) it works fine :



ffmpeg -i LG\ 4K\ HDR\ Demo\ -\ Daylight.mkv -t 00:00:20 -map 0:0 -c:v libx265 -preset medium -crf 18 -x265-params "colorprim=bt2020:colormatrix=bt2020nc:transfer=smpte2084:colormatrix=bt2020nc:hdr=1:info=1:repeat-headers=1:master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(11000000,40)" lg_libx265.mkv




When comparing the output of mediainfo on both files I can see the following properties are not set for the video track :



- 

- Color range
- Color primaries
- Transfer characteristics









mediainfo for vaapi encode :



General
Unique ID : 168011494166392912924249315217763643529 
(0x7E65D636029A5354FE73998A5ED6B089)
Complete name : lg_vaapi.mkv
Format : Matroska
Format version : Version 4
File size : 118 MiB
Duration : 20 s 4 ms
Overall bit rate : 49.6 Mb/s
Writing application : Lavf58.20.100
Writing library : Lavf58.20.100
ErrorDetectionType : Per level 1

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5@Main
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 20 s 4 ms
Bit rate : 48.6 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.098
Stream size : 116 MiB (98%)
Writing library : Lavc58.35.100 hevc_vaapi
Default : Yes
Forced : No
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0040 cd/m2, max: 1100 cd/m2




mediainfo for the libx265 encode :



General
Unique ID : 261605749278874425324960669956061374077 (0xC4CF6F42FE952004772A02D5819DA67D)
Complete name : lg_libx265.mkv
Format : Matroska
Format version : Version 4
File size : 155 MiB
Duration : 47 s 715 ms
Overall bit rate : 27.3 Mb/s
Writing application : Lavf58.20.100
Writing library : Lavf58.20.100
ErrorDetectionType : Per level 1

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@Main
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 47 s 715 ms
Bit rate : 26.8 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.054
Stream size : 152 MiB (98%)
Writing library : x265 2.8:[Linux][GCC 9.1.0][64 bit] 10bit
Encoding settings : cpuid=1111039 / frame-threads=3 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=3840x2160 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=3 / no-allow-non-conformance / repeat-headers / annexb / no-aud / no-hrd / info / hash=0 / no-temporal-layers / open-gop / min-keyint=25 / keyint=250 / gop-lookahead=0 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead=20 / lookahead-slices=8 / scenecut=40 / radl=0 / no-intra-refresh / ctu=64 / min-cu-size=8 / no-rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / limit-tu=0 / rdoq-level=0 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / strong-intra-smoothing / max-merge=2 / limit-refs=3 / no-limit-modes / me=1 / subme=2 / merange=57 / temporal-mvp / weightp / no-weightb / no-analyze-src-pics / deblock=0:0 / sao / no-sao-non-deblock / rd=3 / no-early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / no-b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=0.00 / no-rd-refine / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=crf / crf=18.0 / qcomp=0.60 / qpstep=4 / stats-write=0 / stats-read=0 / ipratio=1.40 / pbratio=1.30 / aq-mode=1 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grain / qpmax=69 / qpmin=0 / no-const-vbv / sar=1 / overscan=0 / videoformat=5 / range=0 / colorprim=9 / transfer=16 / colormatrix=9 / chromaloc=0 / display-window=0 / master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,50) / max-cll=0,0 / min-luma=0 / max-luma=1023 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / no-opt-cu-delta-qp / no-aq-motion / hdr / no-hdr-opt / no-dhdr10-opt / no-idr-recovery-sei / analysis-reuse-level=5 / scale-factor=0 / refine-intra=0 / refine-inter=0 / refine-mv=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-mv-type=0 / copy-pic=1 / max-ausize-factor=1.0 / no-dynamic-refine / no-single-sei
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : Display P3
Mastering display luminance : min: 0.0040 cd/m2, max: 1100 cd/m2




I suspect Color range, Color primaries and Transfer characteristics are necessary to make the file recognized as HDR by my TV. 
How can I add these properties to the VAAPI encoded file ?



Edit :
This patch fixes the problem :
Patch