CameraX - crash app on onPause() while recording video

Question

if minimize app while recording video - everything all right, but once I deploy the application, ерут getting this error:

E/AndroidRuntime: FATAL EXCEPTION: CameraX-video encoding thread
Process: <pkgname>, PID: 12340
java.lang.IllegalStateException
    at android.media.MediaCodec.native_dequeueOutputBuffer(Native Method)
    at android.media.MediaCodec.dequeueOutputBuffer(MediaCodec.java:2698)
    at androidx.camera.core.VideoCapture.videoEncode(VideoCapture.java:604)
    at androidx.camera.core.VideoCapture$2.run(VideoCapture.java:348)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:214)
    at android.os.HandlerThread.run(HandlerThread.java:65)

Or if I stopped recording on onPause videoCapture?.stopRecording(), then getting this error:

E/AndroidRuntime: FATAL EXCEPTION: CameraX-
Process: <pkgname>, PID: 9489
java.lang.IllegalStateException
    at androidx.core.util.Preconditions.checkState(Preconditions.java:96)
    at androidx.core.util.Preconditions.checkState(Preconditions.java:108)
    at androidx.camera.camera2.impl.Camera.openCaptureSession(Camera.java:874)
    at androidx.camera.camera2.impl.Camera.onUseCaseReset(Camera.java:625)
    at androidx.camera.camera2.impl.Camera$11.run(Camera.java:611)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:214)
    at android.os.HandlerThread.run(HandlerThread.java:65)

How right stop record video while minimize app???

here's my code: I collect configurations:

CameraX.unbindAll()
    getDisplayMetrics()
    setPreviewConfig()

    when (typeCapture) {
        TYPE_IMAGE -> {
            setImageCapture()
            CameraX.bindToLifecycle(this, preview, imageCapture)
        }
        TYPE_VIDEO -> {
            setVideoCapture()
            CameraX.bindToLifecycle(this, preview, videoCapture)
        }
    }

set videoConfig and videoCapture:

val videoCaptureConfig = VideoCaptureConfig.Builder().apply {
        setLensFacing(lensFacing)
        setTargetAspectRatioCustom(screenAspectRatio)
        setTargetRotation(rotation)
    }.build()

    videoCapture = VideoCapture(videoCaptureConfig)

then I start recording video:

videoCapture?.startRecording(videoFile, 
CameraXExecutors.mainThreadExecutor(), recordListener)

on onPause() the errors I get are described above

Thanks

Answer 1

I had the same error when stoping the video on onPause. To solve it I added a delay before to call super.onPause() ( see : android: camera onPause/onResume issue).

1. Declare videoSavedListener

private VideoCapture.OnVideoSavedListener videoSavedListener= new VideoCapture.OnVideoSavedListener() {
    @Override
    public void onVideoSaved(@NonNull File file) {
        if(isRecording) {
            isRecording = false;
            // Do whatever you want
        }
    }

    @Override
    public void onError(@NonNull VideoCapture.VideoCaptureError videoCaptureError, @NonNull String message, @Nullable Throwable cause) {

    }
};

2. Add onClickListener

button.setOnClickListener(v -> {
    if(!isRecording){
        videoCapture.startRecording(videoFile, CameraXExecutors.mainThreadExecutor(), videoSavedListener);
        isRecording = true;
     }else{
        videoCapture.stopRecording();
     }
});

3. Override onPause()

    @SuppressLint("RestrictedApi")
    @Override
    public void onPause() {
        if(isRecording){
            isRecording = false;
            videoCapture.stopRecording();

            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            super.onPause();
        }else
            super.onPause();
    }

Please note that video recording use case is currently marked as hidden in the API and is in a very preliminary state and subject to change.

EDIT: With some devices the app still crash when calling onPause() with the videoCapture use case set. I added CameraX.unbindAll() to remove all the use cases before calling super.onPause(). Then, in the onResume() method I bind them again.

Answer 2

Declare a boolean variable

public class MyClass{
private boolean isSafe;
private boolean isPending
onPause{
isSafe=false;
}
onPostResume{
isSafe=true;
if(isPending)
methodForDoingUrAction();
}
methodForDoingUrAction(){

if(isSAfe){
//do your process
isPending=false;
}
else
isPending=true;
}
}