stop pipeline when returns null to signal

[killerrats]

I'm having trouble stopping the pipeline after the splitmuxsink signal to
return a new filename to record. If I return null or empty string will have
a trouble stopping the pipeline. it will hang at changing the pipeline
state.

what is the way to unlink and stop the pipeline? all I do is set pipeline to
null and then unref the pipeline.



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Gstreamer 1.14.4
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Windows
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