[Bug 748041] New: rtpjitterbuffer: Too early requested retransmission for future packets

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748041

            Bug ID: 748041
           Summary: rtpjitterbuffer: Too early requested retransmission
                    for future packets
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: robert.swain at gmail.com
     GNOME version: ---

Related to one of the patches in bug #739868


Currently rtpjitterbuffer requests retransmissions for future packets (i.e.
seqnums following the last received one), based on estimating when they
*should* arrive. This clearly does not work well, as the patch in #739868 to
disable it shows, and also when I run a RTX pipeline here over loopback it is
requesting lots of retransmissions for future packets that just arrive shortly
after (and then a bit later the retransmission).

This wastes bandwidth for nothing, but together with our suboptimal RTCP
handling right now (see e.g. bug #746543) this also wastes early RTCP packets
that we might've actually needed for other things later.

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