Bug related to the preview.

[Samokovsky]

Hi!

Could you please help me with an issue? I'm encountering an intermittent bug related to the preview.

About 3 out of 10 times, the preview shows a "black screen." I've attached the logs and code for reference.

Android 11
Hardware acceleration is enabled by default.

class RTSPFragment : Fragment(), ConnectChecker, ClientListener,
    SurfaceHolder.Callback {

    private lateinit var binding: FragmentRTSPBinding
    private lateinit var surfaceView: OpenGlView
    private lateinit var rtspServerCamera: RtspServerCamera2
    private var clickCount = 0

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        binding = FragmentRTSPBinding.inflate(inflater, container, false)
        return binding.root
    }

    @SuppressLint("SimpleDateFormat")
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        surfaceView = binding.surfaceViewCam2
        surfaceView.holder.addCallback(this)
        rtspServerCamera = RtspServerCamera2(surfaceView, this, 8554)
        rtspServerCamera.streamClient.setOnlyVideo(true)
        rtspServerCamera.streamClient.setClientListener(this)
        rtspServerCamera.streamClient.setAuthorization("admin", "admin")
        rtspServerCamera.setVideoCodec(VideoCodec.H264)
        surfaceView.setIsStreamHorizontalFlip(true)
        lifecycleScope.launch {
            try {
                while (true) {
                    binding.overlayTimeRtsp.text = SimpleDateFormat("HH:mm:ss").format(Date())
                    delay(500)
                }
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }

        binding.logoCameraActivity.setOnClickListener{
            clickCount++
            if (clickCount >= 20) {
                findNavController().navigate(R.id.action_rtsp_to_login)
                clickCount = 0
            }
        }
    }

    private fun prepare(): Boolean {
        Log.d("CameraActivity", "prepare: front ${rtspServerCamera.resolutionsFront} back ${rtspServerCamera.resolutionsBack}")
        val prepared = rtspServerCamera.prepareVideo(1280, 720, 24, 2000 * 1024, 90)
        return prepared
    }

    override fun onAuthError() {
        Log.i("@@@@", "Auth error")
    }

    override fun onAuthSuccess() {
        Log.i("@@@@", "Auth success")
    }

    override fun onConnectionFailed(reason: String) {
        Log.i("@@@@", "Connection failed")
    }

    override fun onConnectionStarted(url: String) {
        Log.i("@@@@", "Connection started")
    }

    override fun onConnectionSuccess() {
        Log.i("@@@@", "Connection success")
    }

    override fun onDisconnect() {
        Log.i("@@@@", "Client disconnect")
    }

    override fun onClientConnected(client: ServerClient) {
        Log.i("@@@@", "Client connected")
    }

    override fun onClientDisconnected(client: ServerClient) {
        Log.i("@@@@", "Client disconnected")
    }

    override fun surfaceCreated(holder: SurfaceHolder) {
        if(prepare())
            rtspServerCamera.startStream()
        rtspServerCamera.switchCamera("0")
    }

    override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
        if (!holder.surface.isValid)
            Log.e("@@@@", "Surface is invalid!")
        if (!rtspServerCamera.isOnPreview)
            rtspServerCamera.startPreview()
    }

    override fun surfaceDestroyed(holder: SurfaceHolder) {
        Log.i("@@@@", "Surface destroyed")
        if (rtspServerCamera.isStreaming) {
            rtspServerCamera.stopStream()
        }
        if (rtspServerCamera.isOnPreview)
            rtspServerCamera.stopPreview()
    }
}

18_12_24.txt