at last I found the key.
i restructured pipeline
# l---queue - valve ---- [original deepstream sdk pipeline after mux] ---------- |
# l |
#srcs - mux - tee funnel ---- overlay
# l |
# l---queue - valve - tee -------- mux ------ demux -------- compositor -------- l
# l l
# l -------- queue ---------- menu ui ------l
It will be of great help for me
Thank you very much bcao