[FFmpeg-trac] #7125(undetermined:new): ffmpeg not identifying jpeg without extension

[FFmpeg]

#7125: ffmpeg not identifying jpeg without extension
-------------------------------------+-------------------------------------
             Reporter:  bjorn        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 The latest version of ffmpeg does not identify the attached jpeg as a jpeg
 when passed as an argument without extension. A build of ffmpeg from
 homebrew works fine.

 How to reproduce:
 {{{
 twiggy:FFmpeg-official bjorn$ ./ffmpeg -i /Users/bjorn/Downloads/chex
 out.gif
 ffmpeg version N-90612-g2f27370111 Copyright (c) 2000-2018 the FFmpeg
 developers
   built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
   configuration: --prefix=/usr/local --enable-gpl --enable-nonfree
 --enable-libass --enable-libvpx --enable-libfdk-aac --enable-libfreetype
 --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx
 --enable-libx264 --enable-libx265 --enable-libopus --enable-libxvid
 --samples=../fate-suite/
   libavutil      56. 13.100 / 56. 13.100
   libavcodec     58. 17.100 / 58. 17.100
   libavformat    58. 10.100 / 58. 10.100
   libavdevice    58.  2.100 / 58.  2.100
   libavfilter     7. 14.100 /  7. 14.100
   libswscale      5.  0.102 /  5.  0.102
   libswresample   3.  0.101 /  3.  0.101
   libpostproc    55.  0.100 / 55.  0.100
 [amrnb @ 0x7f86f3001200] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, amrnb, from '/Users/bjorn/Downloads/chex':
   Duration: 00:41:39.14, bitrate: 3 kb/s
     Stream #0:0: Audio: amr_nb, 8000 Hz, mono, flt
 Output #0, gif, to 'out.gif':
 Output file #0 does not contain any stream
 }}}

 homebrew (custom build options) 3.4.2 works fine, albeit with a warning:

 {{{
 ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
   built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared
 --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-
 avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack
 --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig
 --enable-libfreetype --enable-libmp3lame --enable-librtmp --enable-libsoxr
 --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis
 --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxvid --enable-opencl --enable-videotoolbox --enable-openssl
 --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-
 cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3 --enable-
 nonfree
   libavutil      55. 78.100 / 55. 78.100
   libavcodec     57.107.100 / 57.107.100
   libavformat    57. 83.100 / 57. 83.100
   libavdevice    57. 10.100 / 57. 10.100
   libavfilter     6.107.100 /  6.107.100
   libavresample   3.  7.  0 /  3.  7.  0
   libswscale      4.  8.100 /  4.  8.100
   libswresample   2.  9.100 /  2.  9.100
   libpostproc    54.  7.100 / 54.  7.100
 [jpeg_pipe @ 0x7fe116805e00] Format jpeg_pipe detected only with low score
 of 25, misdetection possible!
 Input #0, jpeg_pipe, from '/Users/bjorn/Downloads/chex':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
 7880x7880 [SAR 788:788 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> gif (native))
 Press [q] to stop, [?] for help
 [swscaler @ 0x7fe116816400] deprecated pixel format used, make sure you
 did set range correctly
 [swscaler @ 0x7fe116816400] No accelerated colorspace conversion found
 from yuv420p to bgr8.
 Output #0, gif, to 'out.gif':
   Metadata:
     encoder         : Lavf57.83.100
     Stream #0:0: Video: gif, bgr8, 7880x7880 [SAR 1:1 DAR 1:1], q=2-31,
 200 kb/s, 25 fps, 100 tbn, 25 tbc
     Metadata:
       encoder         : Lavc57.107.100 gif
 frame=    1 fps=0.0 q=-0.0 Lsize=     636kB time=00:00:00.01
 bitrate=521400.8kbits/s speed=0.0122x
 video:636kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.124281%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7125>
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