Rtsp Video Feed delay on Android Hearlink Android (7.1)remote control

sir i am facing delay issue in video feed of any camera on my hearlink android remote control. i am working on stable_4.4 version of qgroundcontrol and i am using gstreamer 1.18.6 android version but when i build my project for android and install its app in my remote control and access my drone camera feed through rtsp url then my video feed is getting very delayed. i am using cube orange. please guide me how can i eliminate the delay in my feed. my hearlink remote control supports android 7.1 version. And whenever I install that same app in any of my smart android mobiles then I do not get any delay in my feed.