[FFmpeg-trac] #8662(ffmpeg:new): webm to png sequence: wrong and insane framerate

[FFmpeg]

#8662: webm to png sequence: wrong and insane framerate
---------------------------------+---------------------------------------
             Reporter:  php4fan  |                     Type:  defect
               Status:  new      |                 Priority:  critical
            Component:  ffmpeg   |                  Version:  unspecified
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+---------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -i example.webm %d.png
 $ ffmpeg -i come_in_hor.webm -vf "crop=200:247:0:24" come_in_hor/%d.png
 ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
   configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-
 suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
 --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl
 --enable-shared --disable-stripping --disable-decoder=libopenjpeg
 --disable-decoder=libschroedinger --enable-avresample --enable-avisynth
 --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray
 --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite
 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
 libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-
 libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-
 libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr
 --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame
 --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal
 --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883
 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
   libavutil      54. 31.100 / 54. 31.100
   libavcodec     56. 60.100 / 56. 60.100
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 40.101 /  5. 40.101
   libavresample   2.  1.  0 /  2.  1.  0
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.101 /  1.  2.101
   libpostproc    53.  3.100 / 53.  3.100
 Input #0, matroska,webm, from 'come_in_hor.webm':
   Metadata:
     encoder         : Chrome
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0(eng): Video: h264 (Constrained Baseline), yuv420p,
 634x348, SAR 1:1 DAR 317:174, 1k tbr, 1k tbn, 2k tbc (default)
 Output #0, image2, to 'come_in_hor/%d.png':
   Metadata:
     encoder         : Lavf56.40.101
     Stream #0:0(eng): Video: png, rgb24, 200x246 [SAR 1:1 DAR 100:123],
 q=2-31, 200 kb/s, 1k fps, 1k tbn, 1k tbc (default)
     Metadata:
       encoder         : Lavc56.60.100 png
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> png (native))
 Press [q] to stop, [?] for help
 [h264 @ 0x1d9acc0] Reinit context to 640x304, pix_fmt: yuv420pN/A dup=1954
 drop=0
 Input stream #0:0 frame changed from size:634x348 fmt:yuv420p to
 size:634x300 fmt:yuv420p
 frame= 3757 fps=1165 q=-0.0 Lsize=N/A time=00:00:03.75 bitrate=N/A
 dup=3704 drop=0
 video:38033kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown

 }}}

 Note the insane rerported framerate of 1165. This produced a ton of png
 files.

 I don't know the exact frame rate of this file but it's certainly not
 1165.

 I suspect if I were converting to any other video format I would have the
 same issue: the issue seems to be that the framerate of the input file is
 not read correctly.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8662>
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