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Changes between 2.0.x and 2.1.0:
...
* Support for OPUS via libopus.

But latest git version v2.2.0 of VLC does not play sound in matroska movies with opus (A_OPUS/EXPERIMENTAL) tracks. Are there some plans to implement this feature?

A_OPUS/EXPERIMENTAL tracks

Experimental is the key word. As of today there is no defined standard for OPUS in Matroska.

Experimental is the key word. As of today there is no defined standard for OPUS in Matroska.

I believe that Opus support is stable now, perhaps I'm wrong.

From: http://lists.matroska.org/pipermail/mat ... 06883.html

2013-07-05 Moritz Bunkus <moritz at bunkus.org>
* mkvmerge: new feature: Implemented final Opus muxing.

I am experimenting with muxing a mkv with two opus audio language tracks, if it is still experimental I will wait. VLC is able to play the stand alone opus files but within the mkv it throws an error.
The codec id is from mkvmerge. Maybe this is resolved with VLC 2.1.0?

Software:

1. Opusenc: (from the repos) opusenc opus-tools 0.1.6-50-g1ba6702 (using libopus 1.1-beta)
   MKVMerge: mkvmerge GUI v6.4.1 ('Omega Point')
   OS: GNU/Linux Debian x86_64 amd64 jessie
   VLC: (Outdated, from the repos) 2.0.8 Twoflower (revision 2.0.8a-0-g68cf50b)

It's in my TODO list.

Thanks for the response TypX. I'll await the future release of VLC that is able to play a mkv with muxed opus tracks.

VLC is awesome software, thanks to all developers.

Any news about opus+vp9 patch in 2.1.x, there starts to appear more and more those files because vp9+opus in mkv/webm is becoming standard.

VLC can decode opus files fine but inside webm/mkv it shows:
No suitable decoder module:
VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this.

2.2.0 decodes those fine.