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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #27 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
It all comes from the jitterbuffer receiving pts that are somewhat jittery,
with differences a bit above 20ms (the Opus buffers are 20ms). At some point
there is a gap of 34ms (one missing buffer, and the pts difference is 34). The
jitterbuffer decides to cut this time in two, and sends a gap of 17ms, though
the missing packet was 20ms. This is what is causing a buffer of 17ms to be
sent to libopus.

I don't yet know why the pts is jittery.

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