Unable to get the sample from Appsink using C++

[RK29]

Thanks. But I am not able to understand why it is not letting me add elements
to the pipeline? Which element is causing the problem and why as it is
similar to my C# code? Getting below error.
 GStreamer-CRITICAL **: 09:46:54.145: gst_bin_add: assertion 'GST_IS_ELEMENT
(element)' failed



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