Can't play Youtube stream with Opus


I am new to Mopidy and I am trying to play youtube videos but I am getting this warning/error:

This only happens with Opus audio, as I can play some youtube videos that are m4a.

Running gst-inspect-1.0 | grep opus

I get:

libav: avdec_opus: libav Opus decoder
libav: avdec_cllc: libav Canopus Lossless Codec decoder
libav: avdec_hq_hqa: libav Canopus HQ/HQA decoder
libav: avdec_hqx: libav Canopus HQX decoder
libav: avmux_opus: libav Ogg Opus muxer
rtp: rtpopuspay: RTP Opus payloader
rtp: rtpopusdepay: RTP Opus packet depayloader

Any idea what I should do?