Problem in geq filter if height=1

[Michael Koch]

The geq filter doesn't work correctly if the height of the frame is 1.

Make a 8x1 test image:

ffmpeg -f lavfi -i haldclutsrc=2 -vf crop=iw:1 -frames 1 -y test.png

Print the red values of all pixels in the console output:

ffmpeg -loglevel repeat -i test.png -vf geq=r='print(r(X,Y))' -threads 1 -f null NUL

The printed values are all zero, which is obviously wrong.
However if the height of the image is 2 or larger, then it works as expected.
I did already try to force the pixel format to rgb24, but that didn't help.

C:\Users\astro\Desktop\clut>ffmpeg -loglevel repeat -i test.png -vf geq=r='print(r(X,Y))' -threads 1 -f null NUL
ffmpeg version 2022-04-18-git-d5687236ab-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers

built with gcc 11.2.0 (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-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --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. 24.101 / 57. 24.101
libavcodec 59. 26.100 / 59. 26.100
libavformat 59. 22.100 / 59. 22.100
libavdevice 59. 6.100 / 59. 6.100
libavfilter 8. 33.100 / 8. 33.100
libswscale 6. 6.100 / 6. 6.100
libswresample 4. 6.100 / 4. 6.100
libpostproc 56. 5.100 / 56. 5.100

Input #0, png_pipe, from 'test.png':

Duration: N/A, bitrate: N/A
Stream #0:0: Video: png, rgb24(pc), 8x1 [SAR 1:1 DAR 8:1], 25 fps, 25 tbr, 25 tbn

Stream mapping:

Stream #0:0 -> #0:0 (png (native) -> wrapped_avframe (native))

Press [q] to stop, ? for help
0.000000
0.000000
0.000000
0.000000
0.000000
0.000000
0.000000
0.000000
Output #0, null, to 'NUL':

Metadata:

encoder : Lavf59.22.100

Stream #0:0: Video: wrapped_avframe, gbrp(pc, gbr/unknown/unknown, progressive), 8x1 [SAR 1:1 DAR 8:1], q=2-31, 200 kb/s, 25 fps, 25 tbn

Metadata:

encoder : Lavc59.26.100 wrapped_avframe

frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=2.85x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[Michael Koch]

I've seen other cases where the printed values aren't zero, but random numbers. It seems the wrong memory is accessed.