crash abort swscale

[Michael Koch]

Summary of the bug:
crash abort in third command line

How to reproduce:
c:\ffmpeg\ffmpeg -f lavfi -i nullsrc=size=20x20 -vf format=pix_fmts=gray16le,geq='if(bitand(eq(X,1),eq(Y,1)),65535,X)' -frames 1 -y xmap.pgm
c:\ffmpeg\ffmpeg -f lavfi -i nullsrc=size=20x20 -vf format=pix_fmts=gray16le,geq='if(bitand(eq(X,1),eq(Y,1)),65535,Y)' -frames 1 -y ymap.pgm
c:\ffmpeg\ffmpeg -f lavfi -i color=blue:size=20x20 -i xmap.pgm -i ymap.pgm -lavfi "format=pix_fmts=rgb24,remap=fill=red" -frames 1 -y out.png

F:\Wormhole_2020>c:\ffmpeg\ffmpeg -f lavfi -i color=blue:size=20x20 -i xmap.pgm
-i ymap.pgm -lavfi "format=pix_fmts=rgb24,remap=fill=red" -frames 1 -y out.png
ffmpeg version git-2020-02-18-ebee808 Copyright (c) 2000-2020 the FFmpeg develop
ers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfi
g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libb
luray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --e
nable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable
-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 -
-enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enab
le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --en
able-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcode
c --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 -
-enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 41.100 / 56. 41.100
  libavcodec     58. 70.100 / 58. 70.100
  libavformat    58. 38.101 / 58. 38.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 76.100 /  7. 76.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, lavfi, from 'color=blue:size=20x20':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 20x20 [SAR 1:1 DA
R 1:1], 25 tbr, 25 tbn, 25 tbc
Input #1, pgm_pipe, from 'xmap.pgm':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: pgm, gray16le, 20x20, 25 tbr, 25 tbn, 25 tbc
Input #2, pgm_pipe, from 'ymap.pgm':
  Duration: N/A, bitrate: N/A
    Stream #2:0: Video: pgm, gray16le, 20x20, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 (rawvideo) -> format
  Stream #1:0 (pgm) -> remap:xmap
  Stream #2:0 (pgm) -> remap:ymap
  remap -> Stream #0:0 (png)

[Michael Koch]

See also here:
​http://ffmpeg.org/pipermail/ffmpeg-user/2020-February/046887.html

[Carl Eugen Hoyos]

Fixed by Ting Fu in 828f7db5d9fdf9052bb4b6d1b528009fece5bb10