<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><b class="">SETUP:</b> So, I have two sender trying to send video from two different devices. I have synced the clocks of both the senders through NTPD daemon. Then I tried executing this pipeline based on the insights from Streamer conference videos and few posts in this forum. I am basically assuming here that the pipeline is going to the use the NTP clock. External clock sync is all I need to do before I implement this. Please correct me if I am wrong. At the receiver I put both streams into a common RTPbin. </div><div class=""><br class=""></div><div class=""><b class="">PROBLEM: </b>I am not getting the expected results<b class="">. </b>The frames are stuck most of the time or out of sync. Please let me know where I am going wrong. I am not exactly sure on where I have to use the Test-Netclocck examples. I thought that was a substitute for NTP daemon based syncing. </div><div class="">I would be really happy if I could get a pipeline based solution. I am not very familiar with the C API.</div><b class=""><div class=""><b class=""><br class=""></b></div><div class="">The pipeline of both senders look like this</div>SENDER PIPELINE:</b><div class=""><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">VOFFSET=0</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">AOFFSET=0</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69); min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">VELEM="v4l2src device=/dev/video1"</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">VCAPS="video/x-raw,width=352,height=288,framerate=15/1"</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">VSOURCE="$VELEM ! queue ! videorate ! videoconvert ! $VCAPS"</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">VENC="vp8enc ! rtpvp8pay"</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69); min-height: 14px;" class="">VRTPSINK="udpsink port=5000 host=$DEST ts-offset=$VOFFSET name=vrtpsink"</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">VRTCPSINK="udpsink port=5001 host=$DEST sync=false name=vrtcpsink"</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">VRTCPSRC="udpsrc port=5005 name=vrtpsrc"</div></div><div class=""><br class=""></div><div class=""><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">gst-launch-1.0 -v rtpbin name=rtpbin ntp-time-source=clock-time \</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""> $VSOURCE ! $VENC ! rtpbin.send_rtp_sink_0 \</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""> rtpbin.send_rtp_src_0 ! $VRTPSINK \</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""> rtpbin.send_rtcp_src_0 ! $VRTCPSINK \</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""> $VRTCPSRC ! rtpbin.recv_rtcp_sink_0 </div></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""><br class=""></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""><b class="">RECEIVER PIPELINE:</b></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""><b class=""><br class=""></b></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""><div style="margin: 0px; line-height: normal; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">VIDEO_CAPS="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)VP8"</div><div style="margin: 0px; line-height: normal;" class="">VIDEO_CAPS2="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)VP8"</div><div style="margin: 0px; line-height: normal; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">VIDEO_DEC="rtpvp8depay ! vp8dec"</div><div style="margin: 0px; line-height: normal;" class="">VIDEO_DEC2="rtpvp8depay ! vp8dec"</div><div style="margin: 0px; line-height: normal; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">VIDEO_SINK="videoconvert ! autovideosink"</div><div style="margin: 0px; line-height: normal;" class="">VIDEO_SINK2="videoconvert ! autovideosink"</div><div style="margin: 0px; line-height: normal; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; line-height: normal;" class="">gst-launch-1.0 -v rtpbin name=rtpbin ntp-time-source=clock-time ntp-sync=true buffer-mode=synced rtcp-sync-send-time=false\</div><div style="margin: 0px; line-height: normal;" class=""> udpsrc caps=$VIDEO_CAPS port=5000 ! rtpjitterbuffer mode=synced ! rtpbin.recv_rtp_sink_0 \</div><div style="margin: 0px; line-height: normal;" class=""> rtpbin. ! $VIDEO_DEC ! $VIDEO_SINK \</div><div style="margin: 0px; line-height: normal;" class=""> udpsrc port=5001 ! rtpbin.recv_rtcp_sink_0 \</div><div style="margin: 0px; line-height: normal;" class=""> rtpbin.send_rtcp_src_0 ! udpsink port=5005 host=$DEST sync=false \</div><div style="margin: 0px; line-height: normal;" class=""> udpsrc caps=$VIDEO_CAPS2 port=6000 ! rtpjitterbuffer mode=synced ! rtpbin.recv_rtp_sink_1 \</div><div style="margin: 0px; line-height: normal;" class=""> rtpbin. ! $VIDEO_DEC2 ! $VIDEO_SINK2 \</div><div style="margin: 0px; line-height: normal;" class=""> udpsrc port=6001 ! rtpbin.recv_rtcp_sink_1 \ </div><div style="margin: 0px; line-height: normal;" class="">rtpbin.send_rtcp_src_1 ! udpsink port=6005 host=$DEST2 sync=false </div></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""><br class=""></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""><br class=""></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class=""><br class=""></div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">Thank you for your time,</div><div style="margin: 0px; line-height: normal; color: rgb(69, 69, 69);" class="">Thiyagesh</div></body></html>