[FFmpeg-trac] #8084(undetermined:new): Seeking backwards with large mkv files broken

FFmpeg trac at avcodec.org
Fri Aug 16 22:57:49 EEST 2019


#8084: Seeking backwards with large mkv files broken
-------------------------------------+-------------------------------------
             Reporter:  Kanehekili   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 The update of ffmpeg 4.2 has a regression when seeking mkv containers
 larger than 2GB.
 The codecs tested were VC-1 and h264.
 How to reproduce:
 1)Seeking forward/backwards takes a long time , receiving an error like:
 {{{
 [matroska,webm @ 0x801b86f40]Element at 0x81e78160 ending at 0x81ff3e32
 exceeds containing master element ending at 0x7e2ea500
 }}}
 Opencv and direct usage of av_seek_frame on large mkv files show this
 behavior.
 av_seek_frame(...AVSEEK_FLAG_BACKWARD) does not work at all, the stream
 position does not go backwards.
 Works with previous version 4.1

 {{{
 ffmpeg version n4.2 Copyright (c) 2000-2019 the FFmpeg developers
   built with gcc 9.1.0 (GCC)
   configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --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-libmodplug
 --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb
 --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr
 --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2
 --enable-libvidstab --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. 31.100 / 56. 31.100
   libavcodec     58. 54.100 / 58. 54.100
   libavformat    58. 29.100 / 58. 29.100
   libavdevice    58.  8.100 / 58.  8.100
   libavfilter     7. 57.100 /  7. 57.100
   libswscale      5.  5.100 /  5.  5.100
   libswresample   3.  5.100 /  3.  5.100
   libpostproc    55.  5.100 / 55.  5.100
 Hyper fast Audio and Video encoder
 usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]
 outfile}...

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8084>
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