How do i switch between multiple rtsp video streams without stopping pipeline [gapless streaming]

[Ashish Kumar Mishra]

Hi Janardana , 

[ I am also working on same , hence i could be wrong .....
  Reason i am sharing this info is that by the time senior group members
revert to your reply , at least 
  you could evaluate few more test case's  ]

Even i am trying to have an pipeline ( with different plugins than yours )
which could be configured dynamically. Based on my trial and fail method ,
below info could help you:-

1) "...(lt-camera_switch_server:22356): GStreamer-WARNING **: 
Trying to join task 0x7f873c01def0 from its thread would deadlock.You cannot
change the state of an element from its streaming thread. Use g_idle_add()
or post a GstMessage on the bus to schedule the state change from the main
thread...."

This is an warning message which you could neglect ...Somewhere in the forum
i have read , will try to find the discussion & if possible attach the link.


2) Many a place i have read that element's configuration had to be in :-
    Change the element's state to READY  -> Change the parameters /
Create-Link new instance of element's -> Change the element state to
PLAYING. 
     
But with this flow logic , i could observe few scenario's where the error
message's are like 
".....Trying to dispose element XXX , but it is in PAUSED (locked) instead
of the NULL state.
You need to explicitly set elements to the NULL state before droping the
final reference, to allow them to clean up..."

For which i am now making the element state to NULL [ Initial was Ready] 
Hence , please verify the state of element before taking any corrective
action ( gst_element_set_state() )

Also i would have build the pipeline for an single camera input and tried
making it DYNAMIC first , rather than going ahead with 5 camera logic
straight-forward. 


3) There is an error for THREAD joining in log.

Since even i am trying to have an dynamic pipeline , i would be monitoring
your thread to correct my mistake. 

Thanks ,
Ashish Kumar Mishra. 


 




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