[Bug]: Failed to handle method call

[imsujan276]

Version

v1.1.1

Which operating systems have you used?

• [X] Android
• [ ] iOS

Environment that reproduces the issue

Google pixel 5 Android 12

Is it reproducible in the example application?

Yes

RTMP Server

api.video

Reproduction steps

1. Start the stream
2. stop the stream
3. the error gets caught and get seen in the console

Expected result

there should be no errors

Actual result

got the following error

D/HostConnection(14127): HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV_Cache ANDROID_EMU_has_shared_slots_host_memory_allocator ANDROID_EMU_sync_buffer_data ANDROID_EMU_read_color_buffer_dma GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_gles_max_version_3_0 
D/EGL_emulation(14127): eglCreateContext: 0x77d2d4696a10: maj 3 min 0 rcv 3
D/EGL_emulation(14127): eglMakeCurrent: 0x77d2d4696a10: ver 3 0 (tinfo 0x77d4f66bc300) (first time)
E/MethodChannel#video.api.livestream/controller(14127): Failed to handle method call
E/MethodChannel#video.api.livestream/controller(14127): java.lang.NullPointerException
E/MethodChannel#video.api.livestream/controller(14127):     at video.api.flutter.livestream.MethodCallHandlerImpl.onMethodCall(MethodCallHandlerImpl.kt:101)
E/MethodChannel#video.api.livestream/controller(14127):     at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/MethodChannel#video.api.livestream/controller(14127):     at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/MethodChannel#video.api.livestream/controller(14127):     at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/MethodChannel#video.api.livestream/controller(14127):     at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/MethodChannel#video.api.livestream/controller(14127):     at android.os.Handler.handleCallback(Handler.java:938)
E/MethodChannel#video.api.livestream/controller(14127):     at android.os.Handler.dispatchMessage(Handler.java:99)
E/MethodChannel#video.api.livestream/controller(14127):     at android.os.Looper.loopOnce(Looper.java:201)
E/MethodChannel#video.api.livestream/controller(14127):     at android.os.Looper.loop(Looper.java:288)
E/MethodChannel#video.api.livestream/controller(14127):     at android.app.ActivityThread.main(ActivityThread.java:7839)
E/MethodChannel#video.api.livestream/controller(14127):     at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#video.api.livestream/controller(14127):     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
E/MethodChannel#video.api.livestream/controller(14127):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
2
W/System  (14127): A resource failed to call release. 
D/BufferPoolAccessor2.0(14127): bufferpool2 0x77d324753378 : 0(0 size) total buffers - 0(0 size) used buffers - 594/599 (recycle/alloc) - 7/1188 (fetch/transfer)
D/BufferPoolAccessor2.0(14127): evictor expired: 1, evicted: 1
E/flutter (14127): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(error, null, null, java.lang.NullPointerException
E/flutter (14127):  at video.api.flutter.livestream.MethodCallHandlerImpl.onMethodCall(MethodCallHandlerImpl.kt:101)
E/flutter (14127):  at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/flutter (14127):  at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/flutter (14127):  at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/flutter (14127):  at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/flutter (14127):  at android.os.Handler.handleCallback(Handler.java:938)
E/flutter (14127):  at android.os.Handler.dispatchMessage(Handler.java:99)
E/flutter (14127):  at android.os.Looper.loopOnce(Looper.java:201)
E/flutter (14127):  at android.os.Looper.loop(Looper.java:288)
E/flutter (14127):  at android.app.ActivityThread.main(ActivityThread.java:7839)
E/flutter (14127):  at java.lang.reflect.Method.invoke(Native Method)
E/flutter (14127):  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
E/flutter (14127):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
E/flutter (14127): )
E/flutter (14127): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
E/flutter (14127): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:322:18)
E/flutter (14127): <asynchronous suspension>
E/flutter (14127): 

Additional context

No response

Relevant logs output

No response

[ThibaultBee]

Hi, Thanks for reporting the issue. I guess that the issue is due to a force unwrap of the flutterView (see https://github.com/apivideo/api.video-flutter-live-stream/blob/c0a17de876343585fccf656eb471598c18e58f36/android/src/main/kotlin/video/api/flutter/livestream/MethodCallHandlerImpl.kt#L100) For dispose and stops methods, this should do nothing if flutterView is null

I don't know why this happen on your side, when does it crash? Have you call dispose before?

[ThibaultBee]

Could you test with fix https://github.com/apivideo/api.video-flutter-live-stream/commit/5e69d340f433ae6e2d8abd332efd44ccfc37906e

[imsujan276]

Thank you @ThibaultBee. That fixed the closed issue.

But I am getting another issue while starting the streaming.

THIS HAPPENS THE FIRST TIME THE STREAMING. LATER THIS ISSUES DOES NOT COME

On page load, I am calling the init() to initialize the controller. Once initialized, I am starting the streaming.
Am I doing something wrong here?

E/flutter ( 9243): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(failed_to_start_preview, Video has not been configured!, null, null)
E/flutter ( 9243): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
E/flutter ( 9243): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:322:18)
E/flutter ( 9243): <asynchronous suspension>

code I am using

init(){
controller = createLiveStreamController();
    controller!.initialize().then((_) {
      log('VideoStream: Initialized');
      startStreaming();
      listenToInternetConnection();
    }).catchError((e) => showSnackbar(e.toString()));
}

ApiVideoLiveStreamController createLiveStreamController() {
    return ApiVideoLiveStreamController(
      initialAudioConfig: rtmsConfig.audioConfig,
      initialVideoConfig: rtmsConfig.videoConfig,
      onConnectionSuccess: () {
        log('VideoStream: Connection succeeded');
      },
      onConnectionFailed: (error) {
        log('VideoStream: Connection failed: $error');
      },
      onDisconnection: () {
        log('VideoStream: Connection Disconnected');
      },
      onError: (err) {
        log('VideoStream: Connection Error: $err');
      },
    );
  }

Future<void> startStreaming() async {
    try {
      setLiveStatus(LiveStatus.loading);
      await controller?.startStreaming(
        url: rtmsConfig.rtmpUrl,
        streamKey: rtmsConfig.rtmpStreamKey,
      );
      log('VideoStream: Stream Started');
    } catch (e) {
      log('VideoStream: Failed to start stream: $e');
    }
  }

[ThibaultBee]

Hi, I don't reproduced this behavior on my side. Could you fork this repo and modify the example code to show me how to reproduce?

[imsujan276]

I am not doing any extra configurations.

just calling the init function in initState and everything is the same.

To reproduce the error,

1. clear/uninstall previously installed app
2. run the example
3. after asking for permission, you can see the error message in the console

[ThibaultBee]

Ok, it is an issue with the permissions. Could you test: https://github.com/apivideo/api.video-flutter-live-stream/commit/42f8a0e11eb12419fd128daeca56d6f46a9b644f?

[imsujan276]

Now, I am not able to build the app

Getting this error

flutter run -t lib/main_prod.dart --flavor prod
Launching lib/main_prod.dart on sdk gphone64 x86 64 in debug mode...
e: apivideo_live_stream/android/src/main/kotlin/video/api/flutter/livestream/MethodCallHandlerImpl.kt:73:21 Val cannot be reassigned
e: apivideo_live_stream/android/src/main/kotlin/video/api/flutter/livestream/MethodCallHandlerImpl.kt:83:21 Val cannot be reassigned
e: apivideo_live_stream/android/src/main/kotlin/video/api/flutter/livestream/MethodCallHandlerImpl.kt:92:48 No value passed for parameter 'onSuccess'
e: apivideo_live_stream/android/src/main/kotlin/video/api/flutter/livestream/MethodCallHandlerImpl.kt:92:48 No value passed for parameter 'onError'
e: apivideo_live_stream/android/src/main/kotlin/video/api/flutter/livestream/MethodCallHandlerImpl.kt:156:21 Val cannot be reassigned

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':apivideo_live_stream:compileDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
   > Compilation error. See log for more details

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 4s
Running Gradle task 'assembleProdDebug'...                          5.0s
Exception: Gradle task assembleProdDebug failed with exit code 1

[ThibaultBee]

Hi,

CI properly runs (see https://github.com/apivideo/api.video-flutter-live-stream/actions/runs/7787509905). Could you clone the project from scratch?

[imsujan276]

Yes now i am able to run the app.

But getting new error after giving the permission

E/flutter ( 6246): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(failed_to_set_audio_config, Video has not been configured!, null, null)
E/flutter ( 6246): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
E/flutter ( 6246): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:322:18)
E/flutter ( 6246): <asynchronous suspension>
E/flutter ( 6246): 

[ThibaultBee]

This could happens because startPreview is called directly by didChangeAppLifecycleState although video configuration have not been applied. Anyway, internally startPreview will be called after the video configuration is set.

But failed_to_set_audio_config should be failed_to_start_preview.

It is just a message and I guess the behavior is correct now.

[imsujan276]

So, can I leave it as it is?

Will it not cause issues in the future?

[ThibaultBee]

To avoid the error to pop, you can do something like when you call startPreview (ie in didChangeAppLifecycleState)

      if (_controller.isInitialized) {
        _controller.startPreview();
      }

[ThibaultBee]

Alternatively, you might register didChangeAppLifecycleState when the controller has been initialized. But that depends on your implementation.

[ThibaultBee]

This issue is solved in v1.2.0. Please reopen it if you feel something is missing.