[FFmpeg-trac] #9924(undetermined:new): drawbox replace vs rgba

[FFmpeg]

#9924: drawbox replace vs rgba
-------------------------------------+-------------------------------------
             Reporter:  Jozef        |                     Type:  defect
  Chutka                             |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  drawbox      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Using ffmpeg version 2022-09-07-git-e4c1272711-full_build-www.gyan.dev

 Following command does not generate an output file:

 {{{
 ffmpeg -f lavfi -i color=color=#00000000:size=100x100 -vf
 "format=rgba,drawbox=c=blue:h=50:w=50:replace=1" -frames:v 1 -y out.png
 }}}

 Log contains no errors:
 {{{
 ffmpeg version 2022-09-07-git-e4c1272711-full_build-www.gyan.dev Copyright
 (c) 2000-2022 the FFmpeg developers
   built with gcc 12.1.0 (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-bzlib --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-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-libmfx --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-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      57. 36.101 / 57. 36.101
   libavcodec     59. 42.104 / 59. 42.104
   libavformat    59. 30.101 / 59. 30.101
   libavdevice    59.  8.101 / 59.  8.101
   libavfilter     8. 48.100 /  8. 48.100
   libswscale      6.  8.108 /  6.  8.108
   libswresample   4.  9.100 /  4.  9.100
   libpostproc    56.  7.100 / 56.  7.100
 Input #0, lavfi, from 'color=color=#00000000:size=100x100':
   Duration: N/A, start: 0.000000, bitrate: N/A
   Stream #0:0: Video: wrapped_avframe, yuv420p, 100x100 [SAR 1:1 DAR 1:1],
 25 fps, 25 tbr, 25 tbn
 Stream mapping:
   Stream #0:0 -> #0:0 (wrapped_avframe (native) -> png (native))
 Press [q] to stop, [?] for help
 }}}

 If either `format=rgba` is removed or `:replace=1` removed it works.

 According to the doc, `replace`:
 Applicable if the input has alpha. With value 1, the pixels of the painted
 box will overwrite the video’s color and alpha pixels. Default is 0, which
 composites the box onto the input, leaving the video’s alpha intact.

 The problem is that it does not seem to work with rgba.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9924>
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