[Bug 769768] rtpjitterbuffer: lots of improvements around RTX

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769768

Olivier Crête <olivier.crete at ocrete.ca> changed:

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--- Comment #39 from Olivier Crête <olivier.crete at ocrete.ca> ---
Created attachment 335590
  --> https://bugzilla.gnome.org/attachment.cgi?id=335590&action=edit
rtpjitterbuffer: Detect whether to assume equidistant spacing when loss

Assuming equidistant packet spacing when that's not true leads to more
loss than necessary in the case of reordering and jitter. Typically this
is true for video where one frame often consists of multiple packets
with the same rtp timestamp. In this case it's better to assume that the
missing packets have the same timestamp as the last received packet, so
that the scheduled lost timer does not time out too early causing the
packets to be considered lost even though they may arrive in time.

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