Webrtc plugin missed ssrc

[Vladimir Tyutin]

Hi all,
I use webrtcbin for video and audio streaming (see my pipeline below).
The issue that when webrtcbin generates SDP offers in 60% cases a:ssrc
parameter is missed for video stream. In 40% cases it's generated.
It's important because Android client does not create remote video track if
ssrc is missed.
So how to force webrtcbin to generate ssrc all the time?

Here is my pipeline:
#define WEBRTC_PIPELINE    "webrtcbin name=webrtc " STUN_SERVER_PROP "="
STUN_1 " " STUN_SERVER_PROP "=" STUN_2 " " STUN_SERVER_PROP "=" STUN_3 " " \
                    STUN_SERVER_PROP "=" STUN_4 " " STUN_SERVER_PROP "="
STUN_5 " " TURN_SERVER_PROP "=" TURN_1 " " \
                    "v536videosrc sys-init=false push_mode=true device=1
channel=2 encoder=2 format=H264 width=640 height=480 ! video/x-h264,
stream-format=byte-stream, alignment=au, profile=baseline ! rtph264pay
rtp-h264aggregate-mode=2 ! capsfilter caps=" RTP_CAPS_H264 "96 ! queue
leaky=downstream ! webrtc. " \
                    "alsasrc ! queue leaky=downstream ! audioconvert !
opusenc ! rtpopuspay ! capsfilter caps=" RTP_CAPS_OPUS "97 ! webrtc.  "
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