[FFmpeg-trac] #11428(undetermined:new): SIGFPE in xpsnr filter

[FFmpeg]

#11428: SIGFPE in xpsnr filter
-------------------------------------+-------------------------------------
             Reporter:  Ronald S.    |                     Type:  defect
  Bultje                             |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 How to reproduce:
 {{{
 $ ~/Projects/ffmpeg/x86-64-gpl/ffmpeg -i ~/Movies/cif/bus_cif.y4m -i x.ivf
 -lavfi
 '[0:v]settb=1/30,setpts=N[a];[1:v]settb=1/30,setpts=N[b];[a][b]xpsnr' -f
 null -
 ffmpeg version N-118043-g2dc864eb4e Copyright (c) 2000-2024 the FFmpeg
 developers
   built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
   configuration: --enable-gpl --samples=/Users/ronaldbultje/Movies/fate-
 suite --enable-libvpx --enable-libaom --enable-ffplay --enable-sdl2
 --enable-version3 --enable-libdav1d --enable-libx264 --enable-libx265
 --disable-videotoolbox --enable-libvmaf
   libavutil      59. 49.100 / 59. 49.100
   libavcodec     61. 26.100 / 61. 26.100
   libavformat    61.  9.100 / 61.  9.100
   libavdevice    61.  4.100 / 61.  4.100
   libavfilter    10.  6.101 / 10.  6.101
   libswscale      8. 12.100 /  8. 12.100
   libswresample   5.  4.100 /  5.  4.100
   libpostproc    58.  4.100 / 58.  4.100
 Input #0, yuv4mpegpipe, from '/Users/ronaldbultje/Movies/cif/bus_cif.y4m':
   Duration: 00:00:05.00, start: 0.000000, bitrate: 36496 kb/s
   Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p(progressive),
 352x288, SAR 128:117 DAR 1408:1053, 30 fps, 30 tbr, 30 tbn
 Input #1, ivf, from 'x.ivf':
   Duration: 00:00:03.34, start: 0.000000, bitrate: 341 kb/s
   Stream #1:0: Video: av1 (libdav1d) (Main) (AV01 / 0x31305641),
 yuv420p(tv), 352x288 [SAR 1:1 DAR 11:9], 29.97 tbr, 29.97 tbn
 Stream mapping:
   Stream #0:0 (rawvideo) -> settb:default
   Stream #1:0 (libdav1d) -> settb:default
   xpsnr:default -> Stream #0:0 (wrapped_avframe)
 Press [q] to stop, [?] for help
 Floating point exception: 8
 }}}

 This is because xpsnr uses the framerate:
 https://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavfilter/vf_xpsnr.c;h=1b2c2a7c2c7a24da9494f4bddc9c1e368b5cb17a;hb=HEAD#l571
 and this is reset in setpts and/or settb. Adding a fps=30 filter fixes it.
 I believe xpsnr uses fps to do 1st vs. 2nd order diffs (1st if fps<32, 2nd
 if fps>=32). But maybe it's meaningful to give users an alternative way to
 configure this distinction and not crash if the FPS is not set?
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11428>
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