Any tool to debug the deepstream app and watch the stream variables, such as gst buffer?

For example, how to watch the frame_meta in the function osd_sink_pad_buffer_probe?

I set some breakpoints at some lines in this function, but it does not stop at this function.

Any help is appreciated. Thanks in advance.

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I think you can do this via gdb

I have debug the app with gdb, but all times I cannot get into the function osd_sink_pad_buffer_probe. Why?

I think all the symbols should be there if you enable debug option, you can check if the issue persist just write a simple gstreamer app without DS components, I guess it should be not a DS related issue.