[FFmpeg-trac] #9465(undetermined:new): -frames:v 1, unexpected error message

[FFmpeg]

#9465: -frames:v 1, unexpected error message
-------------------------------------+-------------------------------------
             Reporter:  Michael      |                     Type:  defect
  Koch                               |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I don't understand why I get the error message "Could not get frame
 filename number 2 from pattern 'out.png'."
 I have -frames:v 1 in the command line. I did also try -frames 1, same
 problem.

 ffmpeg -i equirectangular.png -f lavfi -i color=brown -lavfi
 [1][0]scale2ref -frames:v 1 -y out.png

 This is the console output:

 ffmpeg version 2021-10-18-git-d04c005021-essentials_build-www.gyan.dev
 Copyright (c) 2000-2021 the FFmpeg developers
   built with gcc 10.3.0 (Rev5, 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-lzma --enable-zlib
 --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth
 --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-
 libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-
 libass --enable-libfreetype --enable-libfribidi --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-libgme --enable-libopenmpt
 --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora
 --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb
 --enable-libopus --enable-libspeex --enable-libvorbis --enable-
 librubberband
   libavutil      57.  7.100 / 57.  7.100
   libavcodec     59. 12.100 / 59. 12.100
   libavformat    59.  6.100 / 59.  6.100
   libavdevice    59.  0.101 / 59.  0.101
   libavfilter     8. 14.100 /  8. 14.100
   libswscale      6.  1.100 /  6.  1.100
   libswresample   4.  0.100 /  4.  0.100
   libpostproc    56.  0.100 / 56.  0.100
 Input #0, png_pipe, from 'equirectangular.png':
   Duration: N/A, bitrate: N/A
   Stream #0:0: Video: png, rgb24(pc), 2400x1200, 25 fps, 25 tbr, 25 tbn
 Input #1, lavfi, from 'color=brown':
   Duration: N/A, start: 0.000000, bitrate: N/A
   Stream #1:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR
 1:1 DAR 4:3], 25 tbr, 25 tbn
 Stream mapping:
   Stream #0:0 (png) -> scale2ref:ref
   Stream #1:0 (rawvideo) -> scale2ref:default
   scale2ref:default -> Stream #0:0 (png)
   scale2ref:ref -> Stream #0:1 (png)
 Press [q] to stop, [?] for help
 Output #0, image2, to 'out.png':
   Metadata:
     encoder         : Lavf59.6.100
   Stream #0:0: Video: png, rgb24(pc, gbr/unknown/unknown, progressive),
 2400x1200 [SAR 2:3 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn
     Metadata:
       encoder         : Lavc59.12.100 png
   Stream #0:1: Video: png, rgb24(pc, progressive), 2400x1200, q=2-31, 200
 kb/s, 25 fps, 25 tbn
     Metadata:
       encoder         : Lavc59.12.100 png
 [image2 @ 000001716850e700] Could not get frame filename number 2 from
 pattern 'out.png'. Use '-frames:v 1' for a single image, or '-update'
 option, or use a pattern such as %03d within the filename.
 Error writing trailer of out.png: Invalid argument
 frame=    1 fps=0.0 q=-0.0 Lq=-0.0 size=N/A time=00:00:00.04 bitrate=N/A
 speed=0.182x
 video:1515kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9465>
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