CameraCapturer must be initialized before calling startCapture

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Facing this issue while implementing WebRTC in Android:

Caused by: java.lang.RuntimeException: CameraCapturer must be initialized before calling startCapture.

build.gradle(:app)

dependencies {
  ......
  implementation 'org.webrtc:google-webrtc:1.0.+'
  ......
}

// Chunk causing problem:

private void getVideoSource() {
    // isScreenCast = false
    videoSource = peerConnectionFactory.createVideoSource(false);
    surfaceTextureHelper = SurfaceTextureHelper.create(Thread.currentThread().getName(), rootEglBase.getEglBaseContext());
    VideoCapturer videoCapturer = createCameraCapturer(new Camera1Enumerator(false));
    localVideoTrack = peerConnectionFactory.createVideoTrack("200", videoSource);
    localVideoTrack.addSink(local_renderer);
    if(videoCapturer != null)
        videoCapturer.startCapture(1000,1000,30); // <- Here is the Exception

}

CameraCapturer is deprecated. There is Camera1Capturer now available.

Answer

You need to initialise before you use it

 private void getVideoSource() {
    VideoCapturer videoCapturer = createVideoCapturer();
    VideoSource videoSource;
    //Create a VideoSource instance
    if (videoCapturer != null) {
        SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create("CaptureThread", rootEglBase.getEglBaseContext());
        videoSource = factory.createVideoSource(videoCapturer.isScreencast());
        videoCapturer.initialize(surfaceTextureHelper, this, videoSource.getCapturerObserver());
    }
   

    localVideoTrack = factory.createVideoTrack("100", videoSource);

    //Create MediaConstraints - Will be useful for specifying video and audio constraints.
    audioConstraints = new MediaConstraints();
    videoConstraints = new MediaConstraints();

    //create an AudioSource instance
    audioSource = factory.createAudioSource(audioConstraints);
    localAudioTrack = factory.createAudioTrack("101", audioSource);

    if (videoCapturer != null) {
        videoCapturer.startCapture(1024, 720, 30);
    }
    binding.localGlSurfaceView.setVisibility(View.VISIBLE);
    // And finally, with our VideoRenderer ready, we
    // can add our renderer to the VideoTrack.
    localVideoTrack.addSink(binding.localGlSurfaceView);
}


Source: stackoverflow