rtsp source synchronisation

[LC]

Hei, hei! 

I am testing rtsp stream synchronization abilities. 
My use case is like this : 2 rtsp live streams in 2 filesinks. 

I am not going to use any mux element to get done synchronization inside
that element. Otherwise i need to demux to get each frame from each specific
rtspsrc to specific filesink.  

I am testing with this pipeline and want to get first frame synchronised but
i can't find the correct way. Here is that pipeline: gst-launch-1.0 -e
rtspsrc rfc7273-sync=true ntp-time-source=running-time 
location=some/media.smp ! rtph264depay ! h264parse ! mp4mux ! filesink
location=file115.mp4 rtspsrc rfc7273-sync=true ntp-time-source=running-time
location=some/media2.smp ! rtph264depay ! h264parse ! mp4mux ! filesink
location=file145.mp4

I also noticed comment on rfc7273-sync feature : "(requires clock and offset
to be provided)". And how can i share it, where to specify it ? 

Can anyone comment what is wrong with that pipeline and how to modify or
reconstruct it ? 

Many thanks! 




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