Syncing two live streams

[Andrew Silby]

Hi Scott,

Try something like this:

Have a look at the examples here:
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good/html/gst-plugins-good-plugins-rtpbin.html

Or try something like this:

Computer 1
gst-launch-1.0 rtpbin name=rtpbin rtp-profile=avpf rtcp-sync-send-time=false 
videotestsrc is-live=true ! video/x-raw,width=1280,height=720,framerate=20/1 
! queue  !  clockoverlay ! videoconvert ! vp8enc ! 
video/x-vp8,width=1280,height=720,framerate=20/1  ! queue !  rtpvp8pay ! 
rtpbin.send_rtp_sink_0 rtpbin.send_rtp_src_0 ! udpsink host=127.0.0.1 
port=10000 rtpbin.send_rtcp_src_0 ! udpsink host=127.0.0.1 port=10001 
sync=false async=false udpsrc port=10002 ! rtpbin.recv_rtcp_sink_0

Computer 2
gst-launch-1.0 rtpbin name=rtpbin rtp-profile=avpf rtcp-sync-send-time=false 
videotestsrc is-live=true ! video/x-raw,width=1280,height=720,framerate=20/1 
! queue  !  clockoverlay ! videoconvert ! vp8enc ! 
video/x-vp8,width=1280,height=720,framerate=20/1  ! queue !  rtpvp8pay ! 
rtpbin.send_rtp_sink_0 rtpbin.send_rtp_src_0 ! udpsink host=127.0.0.1 
port=10003 rtpbin.send_rtcp_src_0 ! udpsink host=127.0.0.1 port=10004 
sync=false async=false udpsrc port=10005 ! rtpbin.recv_rtcp_sink_0

Computer 3
gst-launch-1.0 rtpbin  name=rtpbin2 rtp-profile=avpf compositor 
name=convert  sink_0::xpos=0 sink_0::ypos=0 sink_0::zorder=0 
sink_1::xpos=640 sink_1::ypos=360 sink_1::zorder=1  ! videoscale ! 
video/x-raw,width=1280,height=720,framerate=20/1 ! videoconvert ! queue 
max-size-buffers=0 max-size-bytes=0 max-size-time=0 ! autovideosink udpsrc 
caps="application/x-rtp,media=(string)video, clock-rate=(int)90000, 
encoding-name=(string)VP8, payload=96" port=10000 ! rtpbin2.recv_rtp_sink_0 
rtpbin2. ! rtpvp8depay ! vp8dec ! videorate ! queue  max-size-buffers=0 
max-size-bytes=0 max-size-time=0 ! 
video/x-raw,width=1280,height=720,framerate=20/1 ! videoconvert ! 
convert.sink_0 udpsrc port=10001 ! rtpbin2.recv_rtcp_sink_0 
rtpbin2.send_rtcp_src_0 ! udpsink host=127.0.0.1 port=10002 sync=false 
async=false   udpsrc caps="application/x-rtp,media=(string)video, 
clock-rate=(int)90000, encoding-name=(string)VP8, payload=96" port=10003 ! 
rtpbin2.recv_rtp_sink_1 rtpbin2. ! rtpvp8depay !  vp8dec ! videorate ! queue 
max-size-buffers=0 max-size-bytes=0 max-size-time=0 ! 
video/x-raw,width=1280,height=720,framerate=20/1 ! videoconvert ! 
convert.sink_1 udpsrc port=10004 ! rtpbin2.recv_rtcp_sink_1 
rtpbin2.send_rtcp_src_1 ! udpsink host=127.0.0.1 port=10005 sync=false 
async=false

You can add in audio as well in a similar way. I do exactly what you're 
describing below at the rtpbin framework is excellent.




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