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ristsink and rtpsink: set sync off on rtcp_sink

Marc Leeman requested to merge den_erpel/gstreamer:gst-plugins-bad-feature/rtpmanagerbad-rtpsink-rtcp-sync-false into main

Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-bad/-/merge_requests/2548

When using the following setup (the error can be reproduced using simpler sender pipelines), the receiver resynchronises the clock on RTCP packets. The effect was that a couple seconds were cut out of the playback because an initial RTCP packet was dropped.

When sending out all RTCP packets (setting sync=FALSE on the RTCP updsink), the playback is fine.

This syncs rtpsink with rtpsrc (where this property was already set).

gst-launch-1.0 filesrc location=899-en.mp3
! mpegaudioparse
! mpg123audiodec
! audioconvert
! audioresample
! avenc_g722
! rtpg722pay ! rtpsink uri=rtp://239.1.2.3:1234

gst-launch-1.0 uridecodebin rtp://239.1.2.3:1234?encoding-name=G722
! autoaudiosink

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