Question

我正在开发用于摄像机的Android应用程序，我正在为我的应用程序使用新的CameraX Api。这个api确实很容易实现，并且在我的应用中一切正常，但是问题出在我的前置摄像头录制中。如果我打开前置摄像头，它会显示镜像，这对于每个摄像头视图都是正常的，但是如果我使用前置摄像头录制视频，则录制的视频会水平翻转。我如何防止视频翻转？我想像Snapchat或Instagram一样录制视频

private void startCamera() {

    CameraX.unbindAll();

    Rational aspectRatio = new Rational (textureView.getWidth(), textureView.getHeight());
    Size screen = new Size(textureView.getWidth(), textureView.getHeight()); //size of the screen


    PreviewConfig pConfig = new PreviewConfig.Builder().setLensFacing(lensFacing).setTargetAspectRatio(aspectRatio).setTargetResolution(screen).build();
    final Preview preview  = new Preview(pConfig);

    preview.setOnPreviewOutputUpdateListener(
            new Preview.OnPreviewOutputUpdateListener() {
                //to update the surface texture we  have to destroy it first then re-add it
                @Override
                public void onUpdated(Preview.PreviewOutput output){
                    ViewGroup parent = (ViewGroup) textureView.getParent();
                    parent.removeView(textureView);
                    parent.addView(textureView, 0);

                    textureView.setSurfaceTexture(output.getSurfaceTexture());
                    updateTransform();
                }
            });

    ImageCaptureConfig imageCaptureConfig = new ImageCaptureConfig.Builder().setLensFacing(lensFacing).setCaptureMode(ImageCapture.CaptureMode.MIN_LATENCY)
            .setTargetRotation(getWindowManager().getDefaultDisplay().getRotation()).build();
    final ImageCapture imgCap = new ImageCapture(imageCaptureConfig);

    VideoCaptureConfig videoCaptureConfig = new VideoCaptureConfig.Builder().setLensFacing(lensFacing)
            .setAudioRecordSource(MediaRecorder.AudioSource.MIC)
            .setTargetRotation(getWindowManager().getDefaultDisplay().getRotation()).build();
    final VideoCapture videoCapture = new VideoCapture(videoCaptureConfig);

    findViewById(R.id.vidStart).setOnClickListener(new View.OnClickListener() {
        @SuppressLint("RestrictedApi")
        @Override
        public void onClick(View v) {
            File file = new File(Environment.getExternalStorageDirectory() + "/" + System.currentTimeMillis() + ".mp4");
            imgCap.takePicture(file, new ImageCapture.OnImageSavedListener() {
                @Override
                public void onImageSaved(@NonNull File file) {
                    String msg = "Pic captured at " + file.getAbsolutePath();
                    Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
                }

                @Override
                public void onError(@NonNull ImageCapture.UseCaseError useCaseError, @NonNull String message, @Nullable Throwable cause) {
                    String msg = "Pic capture failed : " + message;
                    Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
                    if(cause != null){
                        cause.printStackTrace();
                    }
                }
            });
            videoCapture.startRecording(file, new VideoCapture.OnVideoSavedListener() {
                @Override
                public void onVideoSaved(@NonNull File file) {
                    String msg = "Vid captured at " + file.getAbsolutePath();
                    Toast.makeText(getBaseContext(), msg,Toast.LENGTH_LONG).show();
                }

                @Override
                public void onError(VideoCapture.UseCaseError useCaseError, String message, @Nullable Throwable cause) {

                }
            });

        }
    });

    findViewById(R.id.vidStop).setOnClickListener(new View.OnClickListener() {
        @SuppressLint("RestrictedApi")
        @Override
        public void onClick(View v) {
            videoCapture.stopRecording();
        }
    });

    //bind to lifecycle:
    CameraX.bindToLifecycle(this, preview, videoCapture);
}

Answer 1

需要翻转输出。在大多数设备中，令人困惑的部分是预览阶段而不是录制阶段。

在使用前置摄像头预览时，类似镜面的预览便于用户使用前置摄像头。

您需要阅读此SO答案以进行深入了解。 how-to-make-video-captured-by-front-camera-not-being-inverse-android

相机应用程序翻转录制的视频

1 个答案: