Tee request pads unexpectedly go missing

Nicolas Dufresne nicolas at ndufresne.ca
Tue May 4 13:47:36 UTC 2021

Le mardi 04 mai 2021 à 02:44 -0500, Nick_law via gstreamer-devel a écrit :
> Hi guys, I am trying to setup a dynamic pipeline and it seems my Tee request
> pads unexpectedly go missing sporadically. 
> Not quite sure how to give the best info as the code base has grown quite
> large.
> I have a pipeline that works around 80% of the time but every now and then
> the pipeline fails with:
> "Error received from element Source_file1: Internal data stream error.
> Debugging information: gstbasesrc.c(3072): gst_base_src_loop ():
> /GstPipeline:gst_pipeline/GstFileSrc:Source_file1:
> streaming stopped, reason not-linked (-1)"

I'm not sure what is your use case, but perhaps having unlinked tee pad is valid
for you application. If this is the case, consider setting the property "allow-
not-linked" to TRUE.

> I created a dot file when the error callback is called and could see that
> some of the tees were not linked and didn't have 
> src request pads. BUT I also created a dot file where I link the the tees to
> the queue and there they are linked.
> In the time between where they are linked and become unlinked I do no more
> mapping. All I do is write data to the filesrc (fifo) and read the filesink
> (also fifo). So there may be delays where there is no data but as far as I
> understand this should not effect the tee request pads?
> I do have a deinterleave element with sometimes pads but that seems to work
> and I have a "pad-added" callback for that and link with gst_pad_link() as
> most online posts have suggested. Not sure if deinterleave with sometimes
> pads can cause issues?
> Any help would be greatly appreciated!
> The first image is the pipeline directly after I link the Tees to queues and
> what it should look like when streaming:
> The second image is the generated when the error-callback is called:
> <http://gstreamer-devel.966125.n4.nabble.com/file/t379842/not.png> 
> <http://gstreamer-devel.966125.n4.nabble.com/file/t379842/error.png> 
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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