Is Opus encoder included in Gstreamer?

[ge_keep]

How to fix "*downstream can't keep up and is consuming samples too slowly*"
error when I run opus at rate=48000. 
If I set rate=8000 or 16000 or 24000, no issues!

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$ gst-launch-1.0 autoaudiosrc ! audioconvert !
"audio/x-raw,rate=48000,channels=1" ! opusenc !  oggmux  ! filesink
location=input.opus 

Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstAudioSrcClock
Redistribute latency...
WARNING: from element
/GstPipeline:pipeline0/GstAutoAudioSrc:autoaudiosrc0/GstAlsaSrc:autoaudiosrc0-actual-src-als:
*Can't record audio fast enough*
Additional debug info:
gstaudiobasesrc.c(863): gst_audio_base_src_create ():
/GstPipeline:pipeline0/GstAutoAudioSrc:autoaudiosrc0/GstAlsaSrc:autoaudiosrc0-actual-src-als:
*Dropped 10080 samples. This is most likely because downstream can't keep up
and is consuming samples too slowly*.
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