Can't not videoPreviewer.decodeThread again with mini 2

[CHEN031226]

Hello,I have a problem.
I want to start video decoding again when I remove all listener, There is no effect in mini2 but other aircraft could.

Remove:
DJIVideoPreviewer.instance().unSetView()
DJISDKManager.videoFeeder()?.remove(self)
DJISDKManager.videoFeeder()?.primaryVideoFeed.removeAllListeners()

Start：
DJIVideoPreviewer.instance().setView(self.fpv.view)
DJISDKManager.videoFeeder()?.add(self)
DJISDKManager.videoFeeder()?.primaryVideoFeed.add(self, with: nil)
DJIVideoPreviewer.instance().start()
DJIVideoPreviewer.instance()?.frameControlHandler = self;

[DJI-William]

Does the object-C sample has this issue. Because when you quit the page, the listener would be removed.