I use gst123 as my regular audio and video player. I'm now using a Saffire 6 USB interface, which works out of the box using jack so I select jack as audio-output device with the -a option like this:

gst123 -a jack Music/audio-file.mp3

this is working fine.

But if I try to play a video file in mkv format

gst123 --fullscreen --audio-output jack Music/music-video.mkv

I get the following error:

Error: Failed to create Opus decoder                                                                                                                  
=> file cannot be played and will be removed from playlist

this is no problem when just running gst123 selecting the system-default pulseaudio output by not specifying any output device.

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