[FFmpeg-trac] #9376(avfilter:new): Wrong conversion from flat to equirectangular

[FFmpeg]

#9376: Wrong conversion from flat to equirectangular
----------------------------------+----------------------------------
             Reporter:  jumpjack  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  4.3.2
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+----------------------------------
 Summary of the bug:
 reprojection between flat and equirectangular apparently add an undesired
 rotation to the image (roll != 0)

 {{{
 ffmpeg -hide_banner   -i test.png
 -vf v360=fisheye:e                      -y test-equi.png
 ffmpeg -hide_banner   -i test-equi.png
 -vf v360=e:e:yaw=10:pitch=10                                    -y test-
 equi-rotated.png
 ffmpeg -hide_banner   -i test-equi-rotated.png
 -vf v360=e:flat
 -y test-flat.png
 ffmpeg -hide_banner   -i test-flat.png
 -vf v360=flat:e,colorkey=0xFFFFFF:0.1   -y test-overlay-rotated.png
 ffmpeg -hide_banner   -i test-overlay-rotated.png
 -vf v360=e:e:pitch=-10:yaw=-10                          -y test-overlay-
 back.png
 ffmpeg -i test-equi.png -i test-overlay-back.png -filter_complex overlay
 -y test-final.png
 }}}

 Last image test-final.png should appear identical to test-equi.png, but it
 is not.

 Version:
 ffmpeg version 2021-07-06-git-758e2da289-full_build-www.gyan.dev Copyright
 (c) 2000-2021 the FFmpeg developers
   built with gcc 10.3.0 (Rev2, 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-librist --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-opencl --enable-libcdio --enable-
 libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb
 --enable-libmp3lame --enable-libshine --  libavutil      57.  0.100 / 57.
 0.100
   libavcodec     59.  3.101 / 59.  3.101
   libavformat    59.  4.100 / 59.  4.100
   libavdevice    59.  0.100 / 59.  0.100
   libavfilter     8.  0.103 /  8.  0.103
   libswscale      6.  0.100 /  6.  0.100
   libswresample   4.  0.100 /  4.  0.100
   libpostproc    56.  0.100 / 56.  0.100
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9376>
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