maintainer-feedback requested: [Bug 235164] multimedia/vlc no audio on .mkv files

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-multimedia mailing
list <multimedia at FreeBSD.org> for maintainer-feedback:
Bug 235164: multimedia/vlc no audio on .mkv files
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235164



--- Description ---
Running vlc-3.0.6_1,4 on FreeBSD 12.0-RELEASE 64-bit.

I'm not sure when this problem crept into vlc; I use it fairly often but I only
have 2 or three .mkv files.

When I run vlc on the command line and pass it a .mkv file I get the following
output:

[0000000800905060] main libvlc: Running vlc with the default interface. Use
'cvlc' to use vlc without interface.
[00000008126be160] mkv demux error: cannot find KaxSegment or missing mandatory
KaxInfo
[0000000814246060] egl_x11 gl error: cannot select OpenGL API
[00000008127c2760] avcodec decoder: Using NVIDIA VDPAU Driver Shared Library 
390.87	Tue Aug 21 15:52:44 PDT 2018 for hardware decoding
[00000008127c2ae0] main decoder error: buffer deadlock prevented

The .mkv file audio is fine when using dragon or gst-play-1.0. According to
mkvinfo (multimedia/mkvtoolnix) the audio is using the OPUS codec.