[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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