[FFmpeg-user] Create a 10-bit VLog test video
Michael Koch
astroelectronic at t-online.de
Sat Sep 19 13:00:11 EEST 2020
Hello all,
I want to create a 10-bit VLog test video which contains 18 levels of
gray, according to Panasonic's VLog curve.
The curve is documented here:
https://pro-av.panasonic.net/en/cinema_camera_varicam_eva/support/pdf/VARICAM_V-Log_V-Gamut.pdf
I want the leftmost bar to be black (128) and the other 17 bars are for
-8 to +8 stops, so that the rightmost bar is at level 1023. I'm using
this command line and the console output is copied below:
ffmpeg -f lavfi -i nullsrc=s=svga,format=gray16 -lavfi
geq=lum='st(0,trunc(18*X/W));64*(128*eq(ld(0),0)+132*eq(ld(0),1)+136*eq(ld(0),2)+144*eq(ld(0),3)+160*eq(ld(0),4)+192*eq(ld(0),5)+240*eq(ld(0),6)+298*eq(ld(0),7)+363*eq(ld(0),8)+433*eq(ld(0),9)+505*eq(ld(0),10)+578*eq(ld(0),11)+652*eq(ld(0),12)+726*eq(ld(0),13)+800*eq(ld(0),14)+874*eq(ld(0),15)+949*eq(ld(0),16)+1023*eq(ld(0),17))'
-pix_fmt yuv444p10le -crf 10 -c:v h264 -t 5 -y VLog_10bit.mov
The video looks perfect when played with FFplay. The leftmost bars are
indistinguishable on a 8-bit monitor because the levels are too close
together, but the rightmost bars look as expected.
However when I play the same video with VLC, the two brightest bars at
the right side have the same shade of gray. I don't understand why. Is
this a problem in my video, or is it a problem in VLC?
When I extraxt a 16-bit PNG image from the video, this looks as expected
with 18 levels of gray.
ffmpeg -i VLog_10bit.mov -frames 1 -y out.png
Unrelated: I did try to add the oscilloscope filter at the end of the
filter chain, but it seems it doesn't work with 16-bit data. There
should be a warning or an error message. oscilloscope=tw=1:s=1
Michael
C:\Users\astro\Desktop\Test_10-bit>c:\ffmpeg\ffmpeg -f lavfi -i
nullsrc=s=svga,format=gray16 -lavfi
geq=lum='st(0,trunc(18*X/W));64*(128*eq(ld(0),0)+132*eq(ld(0),1)+136*eq(ld(0),2)+144*eq(ld(0),3)+160*eq(ld(0),4)+192*eq(ld(0),5)+240*eq(ld(0),6)+298*eq(ld(0),7)+363*eq(ld(0),8)+433*eq(ld(0),9)+505*eq(ld(0),10)+578*eq(ld(0),11)+652*eq(ld(0),12)+726*eq(ld(0),13)+800*eq(ld(0),14)+874*eq(ld(0),15)+949*eq(ld(0),16)+1023*eq(ld(0),17))'
-pix_fmt yuv444p10le -crf 10 -c:v h264 -t 10 -y VLog_10bit.mov
ffmpeg version N-99135-gaa8935b395-2020-09-13-gyan-beta2 Copyright (c)
2000-2020 the FFmpeg developers
built with gcc 10.2.0 (Rev1, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfig --enable-gnutls --enable-iconv --enable-libdav1d
--enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-libopus --enable-libshine
--enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora
--enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg
--enable-lzma --enable-zlib --enable-gmp --enable-libvidstab
--enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom
--enable-libgsm --enable-librav1e --enable-libsvtav1 --enable-avisynth
--enable-libopenmpt --enable-chromaprint --enable-frei0r
--enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite
--enable-libfribidi --enable-libgme --enable-libilbc --enable-libmodplug
--enable-librubberband --enable-libssh --enable-libzmq --enable-libzvbi
--enable-ladspa --enable-libglslang --enable-vulkan --disable-w32threads
--disable-autodetect --enable-libmfx --enable-ffnvcodec
--enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc
--enable-nvdec --enable-dxva2 --enable-amf --enable-static
libavutil 56. 58.100 / 56. 58.100
libavcodec 58.106.100 / 58.106.100
libavformat 58. 54.100 / 58. 54.100
libavdevice 58. 11.101 / 58. 11.101
libavfilter 7. 87.100 / 7. 87.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Input #0, lavfi, from 'nullsrc=s=svga,format=gray16':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (Y1[0][16] / 0x10003159), gray16le,
800x600 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 (rawvideo) -> geq
geq -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0000018100489740] using SAR=1/1
[libx264 @ 0000018100489740] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000018100489740] profile High 4:4:4 Predictive, level 3.1,
4:4:4, 10-bit
[libx264 @ 0000018100489740] 264 - core 161 r3018 db0d417 - H.264/MPEG-4
AVC codec - Copyleft 2003-2020 - 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=4 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=10.0 qcomp=0.60 qpmin=0 qpmax=81 qpstep=4 ip_ratio=1.40
aq=1:1.00
Output #0, mov, to 'VLog_10bit.mov':
Metadata:
encoder : Lavf58.54.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),
yuv444p10le, 800x600 [SAR 1:1 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc58.106.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame= 250 fps=8.6 q=-1.0 Lsize= 13kB time=00:00:09.88 bitrate=
11.0kbits/s speed=0.339x
video:10kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 39.237000%
[libx264 @ 0000018100489740] frame I:1 Avg QP: 8.27 size: 541
[libx264 @ 0000018100489740] frame P:63 Avg QP: 4.13 size: 32
[libx264 @ 0000018100489740] frame B:186 Avg QP: 7.67 size: 35
[libx264 @ 0000018100489740] consecutive B-frames: 0.8% 0.0% 0.0% 99.2%
[libx264 @ 0000018100489740] mb I I16..4: 68.6% 30.5% 0.9%
[libx264 @ 0000018100489740] mb P I16..4: 0.0% 0.0% 0.0% P16..4:
0.0% 0.0% 0.0% 0.0% 0.0% skip:100.0%
[libx264 @ 0000018100489740] mb B I16..4: 0.0% 0.0% 0.0% B16..8:
0.6% 0.0% 0.0% direct: 0.0% skip:99.4% L0: 0.0% L1:100.0% BI: 0.0%
[libx264 @ 0000018100489740] 8x8 transform intra:30.5%
[libx264 @ 0000018100489740] coded y,u,v intra: 0.3% 0.0% 0.0% inter:
0.0% 0.0% 0.0%
[libx264 @ 0000018100489740] i16 v,h,dc,p: 100% 0% 0% 0%
[libx264 @ 0000018100489740] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 88% 2% 10%
0% 0% 0% 0% 0% 0%
[libx264 @ 0000018100489740] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 61% 0% 39%
0% 0% 0% 0% 0% 0%
[libx264 @ 0000018100489740] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000018100489740] kb/s:7.25
C:\Users\astro\Desktop\Test_10-bit>c:\ffmpeg\ffmpeg -i VLog_10bit.mov
-frames 1 -y out.png
ffmpeg version N-99135-gaa8935b395-2020-09-13-gyan-beta2 Copyright (c)
2000-2020 the FFmpeg developers
built with gcc 10.2.0 (Rev1, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfig --enable-gnutls --enable-iconv --enable-libdav1d
--enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-libopus --enable-libshine
--enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora
--enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg
--enable-lzma --enable-zlib --enable-gmp --enable-libvidstab
--enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom
--enable-libgsm --enable-librav1e --enable-libsvtav1 --enable-avisynth
--enable-libopenmpt --enable-chromaprint --enable-frei0r
--enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite
--enable-libfribidi --enable-libgme --enable-libilbc --enable-libmodplug
--enable-librubberband --enable-libssh --enable-libzmq --enable-libzvbi
--enable-ladspa --enable-libglslang --enable-vulkan --disable-w32threads
--disable-autodetect --enable-libmfx --enable-ffnvcodec
--enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc
--enable-nvdec --enable-dxva2 --enable-amf --enable-static
libavutil 56. 58.100 / 56. 58.100
libavcodec 58.106.100 / 58.106.100
libavformat 58. 54.100 / 58. 54.100
libavdevice 58. 11.101 / 58. 11.101
libavfilter 7. 87.100 / 7. 87.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VLog_10bit.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.54.100
Duration: 00:00:10.00, start: 0.000000, bitrate: 10 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Predictive) (avc1 /
0x31637661), yuv444p10le, 800x600 [SAR 1:1 DAR 4:3], 7 kb/s, 25 fps, 25
tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.106.100 libx264
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'out.png':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.54.100
Stream #0:0: Video: png, rgb48be, 800x600 [SAR 1:1 DAR 4:3],
q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.106.100 png
frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
speed=0.773x
video:25kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
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