[FFmpeg-trac] #8921(undetermined:new): Cannot force png format for file wihout extension

[FFmpeg]

#8921: Cannot force png format for file wihout extension
-------------------------------------+-------------------------------------
             Reporter:  aalexgabi    |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  png, format  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 This works
 {{{
 % ffmpeg -i sunglasses.png /tmp/sungasses.png
 }}}
 But this does not
 {{{
 % ffmpeg -i sunglasses.png -f png /tmp/sunglasses
 ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
   built with gcc 10.1.0 (GCC)
   configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-avisynth --enable-fontconfig --enable-gmp --enable-
 gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass
 --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype
 --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack
 --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-
 libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
 --enable-libopus --enable-libpulse --enable-librav1e --enable-libsoxr
 --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora
 --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis
 --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-
 nvenc --enable-omx --enable-shared --enable-version3
   libavutil      56. 51.100 / 56. 51.100
   libavcodec     58. 91.100 / 58. 91.100
   libavformat    58. 45.100 / 58. 45.100
   libavdevice    58. 10.100 / 58. 10.100
   libavfilter     7. 85.100 /  7. 85.100
   libswscale      5.  7.100 /  5.  7.100
   libswresample   3.  7.100 /  3.  7.100
   libpostproc    55.  7.100 / 55.  7.100
 Input #0, png_pipe, from 'sunglasses.png':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: png, rgba(pc), 1330x880 [SAR 2835:2835 DAR
 133:88], 25 tbr, 25 tbn, 25 tbc
 [NULL @ 0x55a7caca4180] Requested output format 'png' is not a suitable
 output format
 /tmp/sunglasses: Invalid argument
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8921>
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