[FFmpeg-trac] #5049(undetermined:new): Strange bug when converting to .webm

[FFmpeg]

#5049: Strange bug when converting to .webm
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  Alexander2015                      |                 Priority:  normal
               Status:  new          |                  Version:
            Component:               |  unspecified
  undetermined                       |               Blocked By:
             Keywords:               |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 Video converted to .webm format with ffmpeg defaults (video: vp9, audio:
 opus) don't playing with Mozilla FireFox. In Chromium-based browsers and
 videoplayers MPlayer, VLC -- playing is Ok. I write bugreport to Mozilla
 and it confirmed: https://bugzilla.mozilla.org/show_bug.cgi?id=1227680

 But stay question: from here source of this bug: 3 (!) sources video,
 FFmpeg or FireFox player ? (I nay try convert source video in raw and
 pcm.)

 3 sources of this video (wget needed):

 http://b1.m24.ru/c/540647.m3u8
 http://b1.m24.ru/c/540647.1.webm
 http://b1.m24.ru/c/540647.576p.mp4

 How to reproduce:
 {{{
 % ffmpeg -i infile.avi -format webm outfile.webm

 ffmpeg version 2.8.2-1 Copyright (c) 2000-2015 the FFmpeg developers
   built with gcc 5.2.1 (Debian 5.2.1-23) 20151028

 built on Linux 3.16-1-686-pae #1 SMP Debian 3.16.2-2 (2014-09-08) i686
 GNU/Linux
 }}}

 Resulted bugged file is here: http://vek-home.ru/bp_c.webm

 If I change audiocodec to libvorbis, then bug leave: http://vek-
 home.ru/bp101.webm

 Other files (from other sources) converted with default options and
 playing in FireFox normally.
 For example: http://vek-home.ru/Alla_KN4.webm

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5049>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker