[FFmpeg-trac] #10488(undetermined:new): mp3 file with wrong extension erroneusly treated as a video

Thu Jul 27 03:11:29 EEST 2023

#10488: mp3 file with wrong extension erroneusly treated as a video
-------------------------------------+-------------------------------------
             Reporter:  Paolo        |                     Type:  defect
  Benvenuto                          |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I have an mp3 file (Dichosos.mp3), which is correctly detected by ffmpeg.
 It has extension mp3. It's correctly detected even if I remove the file
 extension (Dichosos.).

 {{{
 $ ffmpeg -v 9 -loglevel 99 -i Dichosos
 ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg
 developers
   built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
   configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1
 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
 --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
 --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
 --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite
 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
 libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-
 libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus
 --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-
 libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-
 libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-
 libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-
 libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq
 --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
 --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg
 --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883
 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
   libavutil      56. 70.100 / 56. 70.100
   libavcodec     58.134.100 / 58.134.100
   libavformat    58. 76.100 / 58. 76.100
   libavdevice    58. 13.100 / 58. 13.100
   libavfilter     7.110.100 /  7.110.100
   libswscale      5.  9.100 /  5.  9.100
   libswresample   3.  9.100 /  3.  9.100
   libpostproc    55.  9.100 / 55.  9.100
 Splitting the commandline.
 Reading option '-v' ... matched as option 'v' (set logging level) with
 argument '9'.
 Reading option '-loglevel' ... matched as option 'loglevel' (set logging
 level) with argument '99'.
 Reading option '-i' ... matched as input url with argument 'Dichosos'.
 Finished splitting the commandline.
 Parsing a group of options: global .
 Applying option v (set logging level) with argument 9.
 Successfully parsed a group of options.
 Parsing a group of options: input url Dichosos.
 Successfully parsed a group of options.
 Opening an input file: Dichosos.
 [NULL @ 0x55afbcd22740] Opening 'Dichosos' for reading
 [file @ 0x55afbcd233c0] Setting default whitelist 'file,crypto,data'
 Probing mp3 score:25 size:2048
 Probing mp3 score:51 size:4096
 [mp3 @ 0x55afbcd22740] Format mp3 probed with size=4096 and score=51
 [mp3 @ 0x55afbcd22740] Skipping 0 bytes of junk at 0.
 [mp3 @ 0x55afbcd22740] Before avformat_find_stream_info() pos: 0 bytes
 read:65664 seeks:2 nb_streams:1
 [mp3 @ 0x55afbcd22740] All info found
 [mp3 @ 0x55afbcd22740] Estimating duration from bitrate, this may be
 inaccurate
 [mp3 @ 0x55afbcd22740] stream 0: start_time: 0 duration: 121.32
 [mp3 @ 0x55afbcd22740] format: start_time: 0 duration: 121.319 (estimate
 from bit rate) bitrate=128 kb/s
 [mp3 @ 0x55afbcd22740] After avformat_find_stream_info() pos: 21504 bytes
 read:65664 seeks:2 frames:50
 Input #0, mp3, from 'Dichosos':
   Duration: 00:02:01.32, start: 0.000000, bitrate: 128 kb/s
   Stream #0:0, 50, 1/14112000: Audio: mp3, 44100 Hz, stereo, fltp, 128
 kb/s
 Successfully opened the file.
 At least one output file must be specified
 [AVIOContext @ 0x55afbcd2b780] Statistics: 65664 bytes read, 2 seeks
 }}}

 However, if I change the extension to jpg, it's detected as a video:

 {{{
 $ ffmpeg -v 9 -loglevel 99 -i Dichosos.jpg
 ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg
 developers
   built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
   configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1
 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
 --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
 --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
 --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite
 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
 libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-
 libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus
 --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-
 libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-
 libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-
 libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-
 libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq
 --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
 --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg
 --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883
 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
   libavutil      56. 70.100 / 56. 70.100
   libavcodec     58.134.100 / 58.134.100
   libavformat    58. 76.100 / 58. 76.100
   libavdevice    58. 13.100 / 58. 13.100
   libavfilter     7.110.100 /  7.110.100
   libswscale      5.  9.100 /  5.  9.100
   libswresample   3.  9.100 /  3.  9.100
   libpostproc    55.  9.100 / 55.  9.100
 Splitting the commandline.
 Reading option '-v' ... matched as option 'v' (set logging level) with
 argument '9'.
 Reading option '-loglevel' ... matched as option 'loglevel' (set logging
 level) with argument '99'.
 Reading option '-i' ... matched as input url with argument 'Dichosos.jpg'.
 Finished splitting the commandline.
 Parsing a group of options: global .
 Applying option v (set logging level) with argument 9.
 Successfully parsed a group of options.
 Parsing a group of options: input url Dichosos.jpg.
 Successfully parsed a group of options.
 Opening an input file: Dichosos.jpg.
 [NULL @ 0x564cfe81e740] Opening 'Dichosos.jpg' for reading
 [file @ 0x564cfe81f3c0] Setting default whitelist 'file,crypto,data'
 Probing image2 score:50 size:2048
 Probing mp3 score:25 size:2048
 [image2 @ 0x564cfe81e740] Format image2 probed with size=2048 and score=50
 [image2 @ 0x564cfe81e740] Before avformat_find_stream_info() pos: 0 bytes
 read:32768 seeks:0 nb_streams:1
 [mjpeg @ 0x564cfe8209c0] marker=fb avail_size_in_buf=1941110
 [mjpeg @ 0x564cfe8209c0] marker parser used 0 bytes (0 bits)
 [mjpeg @ 0x564cfe8209c0] marker=f3 avail_size_in_buf=1941017
 [mjpeg @ 0x564cfe8209c0] marker parser used 0 bytes (0 bits)
 [mjpeg @ 0x564cfe8209c0] marker=fc avail_size_in_buf=1940990
 [mjpeg @ 0x564cfe8209c0] marker parser used 0 bytes (0 bits)
 [mjpeg @ 0x564cfe8209c0] marker=d0 avail_size_in_buf=1940895
 [mjpeg @ 0x564cfe8209c0] restart marker: 0
 [mjpeg @ 0x564cfe8209c0] marker parser used 0 bytes (0 bits)
 [mjpeg @ 0x564cfe8209c0] marker=fa avail_size_in_buf=1940872
 [mjpeg @ 0x564cfe8209c0] marker parser used 0 bytes (0 bits)
 [mjpeg @ 0x564cfe8209c0] marker=f7 avail_size_in_buf=1940855
 [mjpeg @ 0x564cfe8209c0] bits 223 is invalid
 [image2 @ 0x564cfe81e740] decoding for stream 0 failed
 [image2 @ 0x564cfe81e740] stream 0: start_time: 0 duration: 0.04
 [image2 @ 0x564cfe81e740] format: start_time: 0 duration: 0.04 (estimate
 from stream) bitrate=388222 kb/s
 [image2 @ 0x564cfe81e740] Could not find codec parameters for stream 0
 (Video: mjpeg (JPEG LS), 1 reference frame, none(bt470bg/unknown/unknown,
 center), lossless): unspecified size
 Consider increasing the value for the 'analyzeduration' (0) and
 'probesize' (5000000) options
 [image2 @ 0x564cfe81e740] After avformat_find_stream_info() pos: 1941112
 bytes read:1941112 seeks:0 frames:1
 Input #0, image2, from 'Dichosos.jpg':
   Duration: 00:00:00.04, start: 0.000000, bitrate: 388222 kb/s
   Stream #0:0, 1, 1/25: Video: mjpeg (JPEG LS), 1 reference frame,
 none(bt470bg/unknown/unknown, center), lossless, 25 fps, 25 tbr, 25 tbn,
 25 tbc
 Successfully opened the file.
 At least one output file must be specified
 [AVIOContext @ 0x564cfe827780] Statistics: 1941112 bytes read, 0 seeks
 }}}

 Apparently there is something wrong in the scoring of images/mp3...
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10488>
FFmpeg <https://ffmpeg.org>
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