I found a problem while I was experimenting with the haldclut filter.
But it's simpler to reproduce without haldclut. The input video contains
10 seconds of noise (10-bit) and can be downloaded here (2MB):
http://www.astro-electronic.de/x.mov
My command line compares two cases with hstack.
Left side: first tmix filter, then scale filter
Right side: first scale filter, then tmix filter
In the output video you can see that the right side is darker. I don't
understand why.
It's not a big difference and only visible with strong contrast enhancement.
But the error was big enough to make my haldclut useless.
Below is the console output.
Michael
C:\Users\mKoch\Desktop>c:\ffmpeg\ffmpeg -i x.mov -i x.mov
-filter_complex [0]tm
ix=frames=25,scale=100:100[a];[1]scale=100:100,tmix=frames=25[b];[a][b]hstack,eq
=brightness=0.77:contrast=2,eq=contrast=2,eq=contrast=2,eq=contrast=2,eq=contras
t=2 -y out.mp4
ffmpeg version N-92833-gfccba32b4c Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 8.2.1 (GCC) 20181201
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfi
g --enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-lib
freetype --enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amr
wb --enable-libopenjpeg --enable-libopus --enable-libshine
--enable-libsnappy --
enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx
--enable-l
ibwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --
enable-libzimg --enable-lzma --enable-zlib --enable-gmp
--enable-libvidstab --en
able-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
--enable-libspeex --en
able-libxvid --enable-libaom --enable-libmfx --enable-amf
--enable-ffnvcodec --e
nable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec
--enable-dxva2 --enab
le-avisynth --enable-libopenmpt
libavutil 56. 25.100 / 56. 25.100
libavcodec 58. 42.104 / 58. 42.104
libavformat 58. 25.100 / 58. 25.100
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 46.101 / 7. 46.101
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'x.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.25.100
Duration: 00:00:11.06, start: 0.000000, bitrate: 1533 kb/s
Stream #0:0(eng): Video: h264 (High 4:2:2) (avc1 / 0x31637661),
yuv422p10le,
400x400 [SAR 1:1 DAR 1:1], 1401 kb/s, 25 fps, 25 tbr, 12800 tbn, 50
tbc (defaul
t)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.42.104 libx264
timecode : 19:19:19:17
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, flt
p, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
handler_name : TimeCodeHandler
timecode : 19:19:19:17
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'x.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.25.100
Duration: 00:00:11.06, start: 0.000000, bitrate: 1533 kb/s
Stream #1:0(eng): Video: h264 (High 4:2:2) (avc1 / 0x31637661),
yuv422p10le,
400x400 [SAR 1:1 DAR 1:1], 1401 kb/s, 25 fps, 25 tbr, 12800 tbn, 50
tbc (defaul
t)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.42.104 libx264
timecode : 19:19:19:17
Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, flt
p, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #1:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
handler_name : TimeCodeHandler
timecode : 19:19:19:17
Stream mapping:
Stream #0:0 (h264) -> tmix (graph 0)
Stream #1:0 (h264) -> scale (graph 0)
eq (graph 0) -> Stream #0:0 (libx264)
Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 00000000004fa8c0] using SAR=1/1
[libx264 @ 00000000004fa8c0] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
AVX FMA3 BMI2 AVX2
[libx264 @ 00000000004fa8c0] profile High 4:2:2, level 1.1, 4:2:2, 8-bit
[libx264 @ 00000000004fa8c0] 264 - core 157 r2935 545de2f - H.264/MPEG-4
AVC cod
ec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options:
cabac=1 r
ef=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_pski
p=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0
nr=0 deci
mate=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=2
5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0
qcomp=0.6
0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'out.mp4':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.25.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv422p,
200x100 [SA
R 1:1 DAR 2:1], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
encoder : Lavc58.42.104 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, flt
p, 128 kb/s (default)
Metadata:
handler_name : SoundHandler
encoder : Lavc58.42.104 aac
frame= 20 fps=0.0 q=0.0 size= 0kB time=00:00:01.85 bitrate=
0.2kbits/s
frame= 44 fps= 43 q=0.0 size= 0kB time=00:00:02.81 bitrate=
0.1kbits/s
frame= 68 fps= 44 q=28.0 size= 0kB time=00:00:03.77 bitrate=
0.1kbits/
frame= 92 fps= 45 q=28.0 size= 0kB time=00:00:04.73 bitrate=
0.1kbits/
frame= 116 fps= 45 q=28.0 size= 0kB time=00:00:05.69 bitrate=
0.1kbits/
frame= 140 fps= 45 q=28.0 size= 0kB time=00:00:06.65 bitrate=
0.1kbits/
frame= 164 fps= 46 q=28.0 size= 256kB time=00:00:07.61 bitrate=
275.4kbits/
frame= 188 fps= 46 q=28.0 size= 256kB time=00:00:08.57 bitrate=
244.6kbits/
frame= 212 fps= 46 q=28.0 size= 256kB time=00:00:09.53 bitrate=
220.0kbits/
frame= 236 fps= 46 q=28.0 size= 256kB time=00:00:10.49 bitrate=
199.8kbits/
frame= 252 fps= 46 q=-1.0 Lsize= 592kB time=00:00:11.05 bitrate=
438.9kbits
/s dup=1 drop=0 speed= 2x
video:411kB audio:172kB subtitle:0kB other streams:0kB global
headers:0kB muxing
overhead: 1.551304%
[libx264 @ 00000000004fa8c0] frame I:2 Avg QP:26.49 size: 7296
[libx264 @ 00000000004fa8c0] frame P:64 Avg QP:26.91 size: 4687
[libx264 @ 00000000004fa8c0] frame B:186 Avg QP:30.39 size: 568
[libx264 @ 00000000004fa8c0] consecutive B-frames: 1.6% 0.0% 0.0% 98.4%
[libx264 @ 00000000004fa8c0] mb I I16..4: 0.0% 0.0% 100.0%
[libx264 @ 00000000004fa8c0] mb P I16..4: 0.0% 0.0% 4.6% P16..4:
56.1% 24.1
% 14.9% 0.0% 0.0% skip: 0.4%
[libx264 @ 00000000004fa8c0] mb B I16..4: 0.0% 0.0% 0.1% B16..8:
13.3% 6.4
% 4.8% direct:27.3% skip:48.1% L0:34.6% L1:48.7% BI:16.7%
[libx264 @ 00000000004fa8c0] 8x8 transform intra:0.0% inter:25.2%
[libx264 @ 00000000004fa8c0] coded y,uvDC,uvAC intra: 66.4% 18.2% 0.0%
inter: 44
.6% 0.1% 0.0%
[libx264 @ 00000000004fa8c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 50% 6% 18%
6% 4%
4% 4% 5% 5%
[libx264 @ 00000000004fa8c0] i8c dc,h,v,p: 93% 2% 6% 0%
[libx264 @ 00000000004fa8c0] Weighted P-Frames: Y:15.6% UV:0.0%
[libx264 @ 00000000004fa8c0] ref P L0: 59.6% 20.0% 17.1% 3.1% 0.2%
[libx264 @ 00000000004fa8c0] ref B L0: 94.0% 5.4% 0.6%
[libx264 @ 00000000004fa8c0] ref B L1: 99.3% 0.7%
[libx264 @ 00000000004fa8c0] kb/s:333.49
[aac @ 00000000004fb680] Qavg: 1570.061
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