[FFmpeg-trac] #10316(undetermined:new): FFV1 seems badly broken

[FFmpeg]

#10316: FFV1 seems badly broken
-------------------------------------+-------------------------------------
             Reporter:  Andrew       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  ffv1,        |               Blocked By:
  lossless                           |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: Trying to use FFV1 as a lossless codec for no-recoding
 stream-copy work, or any other purpose, seems pointless. Blues and reds
 are getting mulched.

 How to reproduce: I've created a simple color bars diagnostic image. By
 doing quick encodes to four different "lossless" codecs it is very obvious
 that ffv1 is not working correctly.

 {{{
 ffmpeg -framerate 60 -loop 1 -i colorbar.png -t 10.0 -c:v ffv1 -pix_fmt
 yuv444p test-ffv1.mkv

 ffmpeg -framerate 60 -loop 1 -i colorbar.png -t 10.0 -c:v h264 -crf 0
 -pix_fmt yuv444p test-h264-lossless.mkv

 ffmpeg -framerate 60 -loop 1 -i colorbar.png -t 10.0 -c:v hevc
 -x265-params lossless=1 -pix_fmt yuv444p test-h265-lossless.mkv

 ffmpeg -framerate 60 -loop 1 -i colorbar.png -t 10.0 -c:v vp9 -lossless 1
 -row-mt 1  -pix_fmt yuv444p test-vp9-lossless.mkv

 ffmpeg version 2023-04-10-git-b18a9c2971-full_build-www.gyan.dev Copyright
 (c) 2000-2023 the FFmpeg developers
 built with gcc 12.2.0 (Rev10, 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-bzlib --enable-lzma
 --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt
 --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
 --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d
 --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e
 --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl
 --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-
 libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-
 liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-
 amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec
 --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-
 libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-
 libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-
 libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora
 --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --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      58.  6.100 / 58.  6.100
 libavcodec     60.  9.100 / 60.  9.100
 libavformat    60.  4.101 / 60.  4.101
 libavdevice    60.  2.100 / 60.  2.100
 libavfilter     9.  5.100 /  9.  5.100
 libswscale      7.  2.100 /  7.  2.100
 libswresample   4. 11.100 /  4. 11.100
 libpostproc    57.  2.100 / 57.  2.100
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10316>
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