Question

我有以下方法来启动相机预览并准备MediaRecorder

private boolean prepareVideoRecorder(){

    // BEGIN_INCLUDE (configure_preview)
    //mCamera = CameraHelper.getDefaultCameraInstance();

    if(Utils.hasFrontCamera())
        mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
    else
        mCamera = Camera.open();

    // We need to make sure that our preview and recording video size are supported by the
    // camera. Query camera to find all the sizes and choose the optimal size given the
    // dimensions of our preview surface.
    Camera.Parameters parameters = mCamera.getParameters();
    List<Camera.Size> mSupportedPreviewSizes = parameters.getSupportedPreviewSizes();
    Camera.Size optimalSize = CameraHelper.getOptimalPreviewSize(mSupportedPreviewSizes,
            mSurfaceView.getWidth(), mSurfaceView.getHeight());


    // Use the same size for recording profile.
    CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_LOW);
    profile.audioChannels = 2;
//  profile.videoFrameWidth = optimalSize.width;
//  profile.videoFrameHeight = optimalSize.height;

    Log.e("Resolution ",profile.videoFrameWidth + " - "+profile.videoFrameHeight);
    //profile.videoBitRate = 3000000;
    //profile.videoFrameRate = 24;

    // likewise for the camera object itself.
    parameters.setPreviewSize(profile.videoFrameWidth, profile.videoFrameHeight);
    mCamera.setParameters(parameters);
    try {
        // Requires API level 11+, For backward compatibility use {@link setPreviewDisplay}
        // with {@link SurfaceView}
        mCamera.setPreviewDisplay(mSurfaceView.getHolder());

        if (Utils.isModeCameraLandScape(getActivity())) {
            mCamera.setDisplayOrientation(ORIENTATIONS_LAND.get(Utils.getRotation(context)));
            Log.e("IMAGE", "preCreateCamera land "+Utils.getRotation(context));
        } else {
            mCamera.setDisplayOrientation(ORIENTATIONS_PORT.get(Utils.getRotation(context)));
            Log.e("IMAGE", "preCreateCamera port "+Utils.getRotation(context));
        }
        //mCamera.setDisplayOrientation(90);

    } catch (IOException e) {
        Log.e(TAG, "Surface texture is unavailable or unsuitable" + e.getMessage());
        return false;
    }
    // END_INCLUDE (configure_preview)


    // BEGIN_INCLUDE (configure_media_recorder)
    mMediaRecorder = new MediaRecorder();

    // Step 1: Unlock and set camera to MediaRecorder
    mCamera.unlock();
    mMediaRecorder.setCamera(mCamera);

    // Step 2: Set sources
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC );
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

    // Step 3: Set a CamcorderProfile (requires API Level 8 or higher)
    mMediaRecorder.setProfile(profile);

    // Step 4: Set output file
    String path  = getVideoFile(MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO).getAbsolutePath();
    currentFile = path;
    mMediaRecorder.setOutputFile(path);
    mMediaRecorder.setOrientationHint(270);

    // END_INCLUDE (configure_media_recorder)

    // Step 5: Prepare configured MediaRecorder
    try {
        mMediaRecorder.prepare();
    } catch (IllegalStateException e) {
        Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
        return false;
    } catch (IOException e) {
        Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage());
        releaseMediaRecorder();
        return false;
    }
    return true;
}

我不得不对此进行评论，因为显然在我测试的特定device中（我认为它发生在其他人身上）我无法看到视频预览而且我有一个MediaRecorder - “开始失败：-19”

//        profile.videoFrameWidth = optimalSize.width;
//        profile.videoFrameHeight = optimalSize.height;

我的问题

当我设置

时

    CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_LOW);

到

    CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);

相机似乎没有开始预览，而在Log.ei上获得“E / Resolution：1280 - 720”，但是从我在device的规格上看到的，它应该只是上升到640 - 480

我是否需要设置其他一些参数？

Answer 1

在设置质量之前，您必须检查相机是否支持该质量。

Answer 2

在 MediaRecorder 上设置 QUALITY_HIGH 时，我在nexus 6p设备上遇到了这个问题。

我发现 setMaxDuration（）方法调用的问题导致 MediaRecorder 崩溃，其值过高。

CamcorderProfile.QUALITY_HIGH无法在特定设备上运行

2 个答案: