MediaRecorder，录制音视频音量非常小

Posted 2023-02-25

【中文标题】MediaRecorder，录制音视频音量非常小

【英文标题】：MediaRecorder, recording audio and video has very low volume

【发布时间】：2016-05-02 14:25:38

【问题描述】：

我在一个 android 项目上使用 MediaRecorder 来录制视频和音频文件。 它可以正确录制，但两个文件的音量都非常低。

我用它来配置 MediaRecorder 来录制音频

String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
                    File folder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + ConfigApp.RECORDINGS_FOLDER);
                    if (!folder.exists())
                        success = folder.mkdir();
                    if (success) 
                        mFileName = folder + timeStamp + ".m4a";
                        currentFile = mFileName;
                        chrono.setBase(SystemClock.elapsedRealtime());
                        chrono.start();
                        mRecorder = new MediaRecorder();
                        mRecorder.setAudiosource(MediaRecorder.AudioSource.CAMCORDER);
                        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
                        mRecorder.setOutputFile(mFileName);
                        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);


                        try 
                            mRecorder.prepare();
                         catch (IOException e) 
                            Log.e(TAG, "prepare() failed");
                        
                        mRecorder.start();
                        handler.post(updateVisualizer);
                    

当我录制视频时

// BEGIN_INCLUDE (configure_preview)
    mCamera = CameraHelper.getDefaultCameraInstance();
    // 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_HIGH);
    profile.videoFrameWidth = optimalSize.width;
    profile.videoFrameHeight = optimalSize.height;

    // 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());
        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.CAMCORDER );
    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;

我在setAudioSource 上尝试了除AudioSource.CAMCORDER 之外的其他选项，但我的音量总是很低

我需要配置任何额外的参数吗？

【参考方案1】：

我在使用 MediaRecorder 时遇到了同样的问题，最终找到了正确的工作解决方案。 为了获得高质量的录音，您需要进行以下一些修改： mRecorder.setAudioEncodingBitRate(16*44100); mRecorder.setAudioSamplingRate(44100); *** 上的许多解决方案都会建议.setAudioEncodingBiteRate(16)，但 16 太低而无法被认为是无意义的。

来源：@Grant 对 *** 的回答 very poor quality of audio recorded on my droidx using MediaRecorder, why?

【参考方案2】：

尝试

mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

然后，您的 AudioSource 设置为 MIC。

【讨论】：

原来的录音app或者camcoder app可以吗？

对不起，我只是分享我的经验。并且需要说检查硬件。我是开发语音跟踪应用程序。所以我也有同样的困难。并尝试更改 setAudioSource 选项即可。