#6080: Invalid negative granulepos on Ogg Theora packets reported as wildly
large
DTS
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Reporter: brion | Type: defect
Status: new | Priority: normal
Component: avformat | Version: git-master
Keywords: ogg,theora | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug: Ogg Theora packets with invalid negative granulepos
end up reporting a wildly large packet DTS in libavformat instead of
AV_NOPTS_VALUE when the file is demuxed with libavformat.
This causes downstream problems with ffmpeg2theora, which takes the bogus
DTS at face value and may try inserting billions of duplicate frames to
make up for lost time.
How to reproduce:
{{{
% curl -o bogus.ogv
https://upload.wikimedia.org/wikipedia/commons/archive/1/11/20170113175618
%21Operating-Mechanism-and-Molecular-Dynamics-of-Pheromone-Binding-
Protein-ASP1-as-Influenced-by-pH-pone.0110565.s001.ogv
% ./ffprobe -show_packets bogus.ogv | egrep 'dts=\d{5,}'
ffmpeg version 3.2.2 (git master)
built on 2017-01-13 - Apple LLVM version 8.0.0 (clang-800.0.42.1)
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6080>
FFmpeg <https://ffmpeg.org>
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