[FFmpeg-user] Dolby Vision

Mark Himsley mark.himsley at gmail.com
Sat Dec 7 16:42:38 EET 2019 

Hi,

There are some 4K Dolby Vision files around, like the one linked to
directly from this page of this site, which are not decoded with the
correct colours using git master head FFmpeg (compiled last weekend).

https://4kmedia.org/lg-amaze-dolby-vision-uhd-4k-demo/

When I play the file downloaded from that page on an VG 4K Dolby
Vision capable TV it plays correctly with the right colours, but the
colours are way wrong when decoded/converted with FFmpeg.

Should I be expecting Dolby Vision files to decode correctly? I mean,
it's very close, but just not quite right.

Thanks :-)

Example command line:

$ ffmpeg -i 'LG Amaze Dolby Vision UHD 4K Demo.ts'  -sws_flags lanczos
-filter:v "scale=1920:1080:interl=0,format=yuv420p" -c:v libx264 -crf
18 -an -y out.mkv
ffmpeg version N-95915-g18507b4-shared_linux_x86_64_201911301603
Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
  configuration: --extra-version=shared_linux_x86_64_201911301603
--extra-cflags=' ' --extra-libs=' -lpthread -lm' --pkg-config-flags=
--cross-prefix= --arch=x86_64 --target-os=linux --prefix=/opt/ffbuild
--enable-gpl --enable-version3 --enable-nonfree --disable-ffplay
--disable-dxva2 --enable-libxml2 --enable-openssl --enable-libmp3lame
--enable-libspeex --enable-libtheora --enable-libvorbis
--enable-libopus --enable-libxvid --enable-libvpx --enable-libfdk-aac
--enable-libx264 --enable-libx265 --enable-libopenjpeg --enable-libaom
--enable-libxcb --enable-decklink
  libavutil      56. 36.101 / 56. 36.101
  libavcodec     58. 64.101 / 58. 64.101
  libavformat    58. 35.100 / 58. 35.100
  libavdevice    58.  9.101 / 58.  9.101
  libavfilter     7. 67.100 /  7. 67.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[hevc @ 0x37c9ec0] Skipping NAL unit 62
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'LG Amaze Dolby Vision UHD 4K Demo.ts':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: mp42dby1isom
    creation_time   : 2017-04-13T20:09:18.000000Z
  Duration: 00:00:56.20, start: 0.000000, bitrate: 28362 kb/s
    Stream #0:0(und): Video: hevc (Main 10) (dvhe / 0x65687664),
yuv420p10le(tv), 3840x2160 [SAR 1:1 DAR 16:9], 27713 kb/s, 60 fps, 60
tbr, 60k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2017-04-13T20:09:18.000000Z
      handler_name    : video handler
      encoder         : DOVI Coding
    Stream #0:1(und): Audio: eac3 (ec-3 / 0x332D6365), 48000 Hz,
5.1(side), fltp, 640 kb/s (default)
    Metadata:
      creation_time   : 2017-04-13T20:09:18.000000Z
      handler_name    : sound handler
    Side data:
      audio service type: main
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
Press [q] to stop, [?] for help
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[libx264 @ 0x37f2940] using SAR=1/1
[libx264 @ 0x37f2940] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
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[libx264 @ 0x37f2940] profile Progressive High, level 4.2, 4:2:0, 8-bit
[libx264 @ 0x37f2940] 264 - core 157 r2969 d4099dd - H.264/MPEG-4 AVC
codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html -
options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7
psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2
b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00
Output #0, matroska, to 'out.mkv':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: mp42dby1isom
    encoder         : Lavf58.35.100
    Stream #0:0(und): Video: h264 (libx264) (H264 / 0x34363248),
yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 60 fps, 1k tbn, 60 tbc
(default)
    Metadata:
      creation_time   : 2017-04-13T20:09:18.000000Z
      handler_name    : video handler
      encoder         : Lavc58.64.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
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speed=   0x
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speed=   0x
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99.4kbits/s speed=0.0442x
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<SNIP - nothing interesting in here>
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bitrate=27572.6kbits/s speed=0.292x
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frame= 3372 fps= 18 q=-1.0 Lsize=  184967kB time=00:00:56.15
bitrate=26985.2kbits/s speed=0.296x
video:184940kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.014368%
[libx264 @ 0x37f2940] frame I:23    Avg QP:17.12  size:372237
[libx264 @ 0x37f2940] frame P:1397  Avg QP:21.18  size:103814
[libx264 @ 0x37f2940] frame B:1952  Avg QP:25.00  size: 18334
[libx264 @ 0x37f2940] consecutive B-frames: 22.3%  1.2%  1.1% 75.4%
[libx264 @ 0x37f2940] mb I  I16..4: 22.5% 50.1% 27.3%
[libx264 @ 0x37f2940] mb P  I16..4:  0.7%  5.0%  1.1%  P16..4: 42.2%
13.8% 13.0%  0.0%  0.0%    skip:24.2%
[libx264 @ 0x37f2940] mb B  I16..4:  0.1%  0.7%  0.5%  B16..8: 29.7%
3.9%  1.9%  direct: 3.3%  skip:59.9%  L0:34.9% L1:50.8% BI:14.3%
[libx264 @ 0x37f2940] 8x8 transform intra:66.6% inter:58.6%
[libx264 @ 0x37f2940] coded y,uvDC,uvAC intra: 83.7% 60.1% 24.9%
inter: 23.1% 16.1% 6.0%
[libx264 @ 0x37f2940] i16 v,h,dc,p: 41% 16%  7% 36%
[libx264 @ 0x37f2940] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 19% 14%  6%
10%  7% 14%  7% 13%
[libx264 @ 0x37f2940] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 17% 11%  7%
12%  9% 13%  7% 11%
[libx264 @ 0x37f2940] i8c dc,h,v,p: 63% 19% 13%  5%
[libx264 @ 0x37f2940] Weighted P-Frames: Y:8.7% UV:5.0%
[libx264 @ 0x37f2940] ref P L0: 68.6% 13.3% 11.9%  6.1%  0.1%
[libx264 @ 0x37f2940] ref B L0: 88.4%  9.2%  2.4%
[libx264 @ 0x37f2940] ref B L1: 93.4%  6.6%
[libx264 @ 0x37f2940] kb/s:26957.74


-- 
Mark Himsley

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