[Bug 771723] opusdec: too short buffers trigger error instead of PLC

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771723

--- Comment #3 from Marcin Lewandowski <marcin at saepia.net> ---
I generally speaking use opusenc with dtx=true inband-fec=true rest of settings
is default. Opusdec with use-inband-fec=true plc=true apply-gain=false.

rtpjitterbuffer (or rather rtpbin that builds one) has do-lost=true
do-retransmission=true drop-on-latency=true.

I have been changing rtpjitterbuffer latency and opusenc bitrate (in range
64-128kbit/s) and it seems that this does not affect the issue - such error
still happens from time to time.

I have been using simple pipelines such as

(some source) ! ... ! opusenc ! rtpopuspay ! udpsink 

and

udpsrc ! rtpjitterbuffer ! rtpopusdepay ! opusdec ! ... ! (some sink)


and rtpbin with retransmission enabled and it happens from time to time in both
cases.

It is really hard to reproduce as it hapens rarely and I am unable to log full
GST_DEBUG=... in this environment (it's production machine).

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