How to debug appsink program can show the debug info like GST_DEBUG=4 gst-launch-1.0 --gst-debug="*CAPS*:5"?

[Erickson.LU]

The first phenomenon is that I can use the pipeline ```GST_DEBUG=4
gst-launch-1.0 --gst-debug="*CAPS*:5" v4l2src io-mode=1 device=/dev/video0 !
videoconvert ! "video/x-raw, width=(int)640, height=(int)480,
format=(string)I420" ! x265enc speed-preset=5 log-level=3 tune=4 !
rtph265pay ssrc=1 pt=96 config-interval=5 sprop-parameter-sets="12345" !
udpsink host=127.0.0.1 port=3220 sync=false async=false```or```GST_DEBUG=4
gst-launch-1.0 --gst-debug="*CAPS*:5" videotestsrc !
video/x-raw,format=I420,height=480,width=640,framerate=30/1,pixel-aspect-ratio=1/1
! x265enc ! rtph265pay ssrc=1 pt=96 config-interval=5
sprop-parameter-sets=12345 ! udpsink clients=127.0.0.1:3220 sync=false
async=false```streaming out and receive it at local by my
appsink_program.But if I use that and replace the address by 192.168.1.7, ps
the pipeline run at 192.168.1.8, and the gateway I set is 192.168.1.7, which
is the machine run my appsink_program.And then if I run the program at
192.168.1.7, the appsink_program will error by Internal data flow error and
the appsink call its eos callback.The GstMessage show that udpsrc in appsink
error: Internal data flow error..but it will be ok at loacl 127.0.0.1.To be
honest, I want to debug it, but I don't know how can I do that seems my
...and where the appsink callback wrong, even though it can run functional
at local.So, I use  gst_bus_add_watch(bus_,
(GstBusFunc)GstUdpsrc2AppSink::GstMessageParser, this); and implement
GstMessageParser and themsg debug info in GstMessage is too short as it just
show the error at
gstbasesrc.c(2948):gst_base_src_loop():/GstPipeline:pipeline0/GstUDPSrc:udpsrc0:streaming
task paused, reason not-negotiated(-4).I need some method to show the debug
info like GST_DEBUG=4 gst-launch-1.0 --gst-debug="*CAPS*:5" can give me, How
can I do that in my appsink program, Thanks....



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