Am 11.10.2020 um 21:07 schrieb Michael Koch:
Am 11.10.2020 um 20:56 schrieb Paul B Mahol:
On Sun, Oct 11, 2020 at 07:37:25PM +0200, Michael Koch wrote:
I tested all 4 DNG images again with the latest FFmpeg version
(Gyan's build
from today).
I tested with and without zscale filter. All tests failed. When
testing with
IrfanView, all DNG input images seem to be ok.
Your issues is that you do not know how to use zscale properly.
DNG decoding is just fine, what is missing is colorspace stuff in
swscale,
for proper display.
Can you please give an example for the correct zscale options?
Finally I found a command line that converts DNG (from Adobe DNG
converter) to JPG with a more or less acceptable result:
ffmpeg -i IMG_3459.dng -vf
zscale=t=linear,tonemap=gamma:param=1.85,tonemap=linear:param=64,colorlevels=rimin=0.0:gimin=0.0:bimin=0.0:rimax=0.53:gimax=1:bimax=0.57
-y out.jpg
But I think everything after "zscale" is only a dirty workaround to
correct errors that were made somewhere else. Especially the strong
amplification by factor 64 and strong color correction doesn't look
right. Please also note that the size of the output image is wrong. It's
bigger than the input image and has black borders at the left and top.
The console output is below.
Michael
C:\Users\astro\Desktop\dng>c:\ffmpeg\ffmpeg -i IMG_3459.dng -vf
zscale=t=linear,tonemap=gamma:param=1.85,tonemap=linear:param=64,colorlevels=rimin=0.0:gimin=0.0:bimin=0.0:rimax=0.53:gimax=1:bimax=0.57
-y out.jpg
ffmpeg version 2020-10-11-git-7ea4bcff7b-full_build-www.gyan.dev
Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static
--disable-w32threads --disable-autodetect --enable-fontconfig
--enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp
--enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
--enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi
--enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg
--enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype
--enable-libfribidi --enable-libvidstab --enable-libvmaf
--enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid
--enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va
--enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan
--enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt
--enable-libopencore-amrwb --enable-libmp3lame --enable-libshine
--enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc
--enable-libilbc --enable-libgsm --enable-libopencore-amrnb
--enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa
--enable-libbs2b --enable-libflite --enable-libmysofa
--enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 56. 60.100 / 56. 60.100
libavcodec 58.111.100 / 58.111.100
libavformat 58. 62.100 / 58. 62.100
libavdevice 58. 11.102 / 58. 11.102
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
[tiff @ 000001d36e8cf800] Assuming black level pattern values are identical
[tiff @ 000001d36e8cf800] Tiled TIFF is not allowed to strip
[tiff_pipe @ 000001d36e8cd800] Stream #0: not enough frames to estimate
rate; consider increasing probesize
Input #0, tiff_pipe, from 'IMG_3459.dng':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: tiff, bayer_rggb16le, 5568x3708, 25 tbr, 25
tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (tiff (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[tiff @ 000001d36e8d4900] Assuming black level pattern values are identical
[tiff @ 000001d36e8d4900] Tiled TIFF is not allowed to strip
[swscaler @ 000001d3706eed40] deprecated pixel format used, make sure
you did set range correctly
[tonemap @ 000001d36e901040] Missing color space information,
desaturation is disabled
[tonemap @ 000001d36e900240] Missing color space information,
desaturation is disabled
Output #0, image2, to 'out.jpg':
Metadata:
encoder : Lavf58.62.100
Stream #0:0: Video: mjpeg, yuvj444p(pc), 5568x3708, q=2-31, 200
kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.111.100 mjpeg
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame= 1 fps=0.5 q=12.1 Lsize=N/A time=00:00:00.04 bitrate=N/A
speed=0.0185x
video:853kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
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