VideoFeed No Data callbacks

[milkywayriver]

after call addVideoDataListener, sometimes there was no data callback... and after a while, the log print an error:

E/DJICameraInspire2Abstraction: update support key failed! retry=8

but in sometimes, everything was ok. this log was not printed.

these are my code:

    fun startVideoFeed(idx:Int):Observable<VideoBuf>{
        var listener:VideoFeeder.VideoDataListener? = null
        var vf:VideoFeeder.VideoFeed? = null

        Timber.i("startVideoFeed called.idx:$idx, version:${BuildConfig.VERSION_NAME}")
        return Observable.create<VideoBuf> { e->
            val vfr = VideoFeeder.getInstance()
            var videoSource = if (idx == 0 ) UsbAccessoryService.VideoStreamSource.Camera.index else UsbAccessoryService.VideoStreamSource.Fpv.index
            var vf = if (idx == 0 ) vfr.primaryVideoFeed else vfr.secondaryVideoFeed
            listener = VideoFeeder.VideoDataListener { bytes, i ->
                e.onNext(VideoBuf(bytes, i, videoSource))
            }
            val success = vf.addVideoDataListener(listener!!)
            if (!success){
                e.onError(IllegalStateException("addVideoDataListener failed!"))
            }else{
                Timber.i("addVideoDataListener, ok waiting for callbacks.")
            }
        }.doOnDispose {
            Timber.i("startVideoFeed disposed, remove callback.")
             vf?.removeVideoDataListener(listener)
         }
    }

could you tell me what's wrong.?

[milkywayriver]

sdk version:

    implementation 'com.android.support:multidex:1.0.2'
    implementation 'com.squareup:otto:1.3.8'
    implementation ('com.dji:dji-sdk:4.10', {
//             Uncomment the following line if your app does not need Anti Distortion for
//             Mavic 2 Pro and Mavic 2 Zoom. It will greatly reducing the size of the APK:
        exclude module: 'library-anti-distortion'
//             Uncomment the following line if your APP does not need network RTK
        exclude module: 'library-networkrtk-helper'
    })
    compileOnly 'com.dji:dji-sdk-provided:4.10'

[milkywayriver]

I also try the demo，i see the same issue occasionally.

[dji-dev]

Public comment from Luce Luo in Zendesk ticket #27699:

Dear Customer,

Thank you for contacting DJI. To help us collect questions in detail, please fill in the form below and we will handle this ticket once we have received it. https://formcrafts.com/a/dji-developer-feedback-en

Thanks,

Luce Luo DJI Dev Team