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.
I have this problem too. Try transcode OPUS to MP4 works for me. So that's must be something related to VLC's OPUS module.
I seem to have the same bug with .webm file and on Gentoo Linux -- but with OPUS codec. (It's VLC 3.0.4)
(In reply to Eric Camachat from comment #1) Does playing a pure opus audio file work?
(In reply to Thomas Zander from comment #3) Plays opus audio only works fine. File format are the same (mkv), but with video track it will be no sound output. I also tested VLC on MacOS same problem exists, too.
(In reply to Thomas Zander from comment #3) Correction: VLC on MacOS works fine.
Created attachment 201691 [details] VLC knows it didn't played audio from statistics info. VLC knows it decoded opus but didn't play it.
I too am experiencing this problem. Playback with Opus in OGG works properly.
I was hoping 3.0.7 contains a fix, but it seems still affected.