Question

我正在构建一个录制视频的应用程序-非常简单。我正在使用Camera2 API和MediaRecorder来实现这一目标。我已经能够成功录制视频，但是声音和视频正在异步录制。

假设我录制了一个5秒钟的视频-输出将是一个长度为10秒的视频文件。前5秒钟是播放音频的静止帧，后5秒钟是没有声音的视频帧。好像MediaRecorder甚至在开始接收视频帧之前就在录制音频。

我用于测试的设备是Samsung Galaxy7。我设法找到一个在线面临类似问题的人，但没有答案/答案：Android Audio and Video track playing subsequently

我如何设置MediaRecorder：

private void setUpMediaRecorder() throws IOException {
    final Activity activity = this;
    if (null == activity) {
        print("Null activity!");
        return;
    }

    mediaRecorder = new MediaRecorder();
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    if (nextVideoAbsolutePath == null || nextVideoAbsolutePath.isEmpty()) {
        nextVideoAbsolutePath = getVideoFilePath(this);
    }
    mediaRecorder.setOutputFile(nextVideoAbsolutePath);
    mediaRecorder.setVideoEncodingBitRate(10000000);
    mediaRecorder.setVideoFrameRate(30);
    mediaRecorder.setVideoSize(videoSize.getWidth(), videoSize.getHeight());
    mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
    switch (sensorOrientation) {
        case SENSOR_ORIENTATION_DEFAULT_DEGREES:
            mediaRecorder.setOrientationHint(DEFAULT_ORIENTATIONS.get(rotation));
            break;
        case SENSOR_ORIENTATION_INVERSE_DEGREES:
            mediaRecorder.setOrientationHint(INVERSE_ORIENTATIONS.get(rotation));
            break;
    }
    mediaRecorder.prepare();
}

我的StartRecording()函数：

void startRecording()
{
    //Check the camera and TextureView are ready
    if (null == cameraDevice || !textureView.isAvailable() || null == previewSize) {
        return;
    }

    try {

        //Close the existing capture session used for preview
        closePreviewSession();

        //Set up the MediaRecorder
        setUpMediaRecorder();

        //Compile list of surfaces
        List<Surface> surfaces = new ArrayList<>();
        surfaces.add(previewSurface);
        final Surface recorderSurface = mediaRecorder.getSurface();
        surfaces.add(recorderSurface);

        // Start the capture session
        // Once the session starts, we can update the UI and start recording
        cameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
            @Override
            public void onConfigured(CameraCaptureSession cameraCaptureSession) {
                //Store a reference to the session
                currentCaptureSession = cameraCaptureSession;

               //Flag that recording has started
               isRecording = true;
               toggleRecordingButton();

                try {
                    //Initiate requestBuilder
                    captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);

                    //Add the surfaces to the request
                    captureRequestBuilder.addTarget(previewSurface); 
                    captureRequestBuilder.addTarget(recorderSurface);

                    //Build
                    captureRequest = captureRequestBuilder.build();
                    print("CameraCaptureSession stateCallback onConfigured() - Starting media recorder");

                    //Start recording
                    mediaRecorder.start();

                    //Set repeating request for VIDEO
                    currentCaptureSession.setRepeatingRequest(captureRequest, new CameraCaptureSession.CaptureCallback() {
                        @Override
                        public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {

                        }
                    }, null);

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
                print("onConfigureFailed");
                Activity activity = MainActivity.this;
                if (null != activity) {
                    Toast.makeText(activity, "Failed", Toast.LENGTH_SHORT).show();
                }
                isRecording = false;
            }
        }, backgroundHandler);
    } catch (Exception e) {
        e.printStackTrace();
    }


}

我的StopRecording()函数：

private void stopRecording() {
    // UI
    isRecording = false;
    toggleButtonsWhileRecording();

    // Stop recording
    mediaRecorder.stop();
    mediaRecorder.reset();

    //Reset path
    nextVideoAbsolutePath = null;
}

Answer 1

事实证明，这是仅限于某些Samsung Galaxy设备的错误。有关此问题的更多信息，以及在录制后检测长帧并进行纠正的解决方法： Saved video file only has one video frame

总而言之，该错误与深度睡眠中出现的这些设备有关。重置手机后，问题得以解决（但如果我让手机进入“深度睡眠”，则会再次出现。）

Camera2 MediaRecorder |音频和视频正在异步录制

1 个答案: