沒有音頻的Android記錄視頻

Question

Android中有沒有可能在沒有音頻流的情況下從相機錄製視頻？

目標：減少輸出文件的大小。

Answer 1

您可以使用MediaRecorder不調用setAudio *就可以了。這是使用MediaRecorder我的第一次，但這個例子似乎工作：

public class CamcorderView extends SurfaceView implements 
     SurfaceHolder.Callback { 

    private SurfaceHolder mHolder; 

    private Camera mCamera; 
    private MediaRecorder mRecorder; 

    public CamcorderView(Context context, AttributeSet attrs) { 
     super(context, attrs); 

     mHolder = getHolder(); 
     mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
     mHolder.addCallback(this); 

     mCamera = Camera.open(); 
     mRecorder = new MediaRecorder(); 

    } 

    public void stop() { 
     mRecorder.stop(); 
    } 

    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, 
      int height) { 
    } 

    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) { 
    } 

    @Override 
    public void surfaceCreated(SurfaceHolder holder) { 
     mCamera.unlock(); 
     mRecorder.setCamera(mCamera); 

     mRecorder.setPreviewDisplay(mHolder.getSurface()); 

     // You may want to change these 
     mRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); 
     mRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT); 
     mRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT); 

     // You'll definitely want to change this 
     mRecorder.setOutputFile("/mnt/sdcard/out"); 

     try { 
      mRecorder.prepare(); 
     } catch (IllegalStateException e) { 
      Log.e("IllegalStateException", e.toString()); 
     } catch (IOException e) { 
      Log.e("IOException", e.toString()); 
     } 
     mRecorder.start(); 

    } 
} 

你也可以撥打：

• setVideoSize(int, int);
• setVideoFrameRate(int);

Answer 2

你可以準備MediaRecorder通過從內置配置文件（CamcorderProfile）複製必需的字段。只是忽略音頻設置，你應該很好去。編輯下面的代碼以滿足您的需求，第3步是此處的重要部分。

private boolean prepareVideoRecorder() { 

    mCamera = getCameraInstance(); 
    mMediaRecorder = new MediaRecorder(); 

    // store the quality profile required 
    CamcorderProfile profile = CamcorderProfile.get(cameraid, CamcorderProfile.QUALITY_HIGH); 

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

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

    // Step 3: Set all values contained in profile except audio settings 
    mMediaRecorder.setOutputFormat(profile.fileFormat); 
    mMediaRecorder.setVideoEncoder(profile.videoCodec); 
    mMediaRecorder.setVideoEncodingBitRate(profile.videoBitRate); 
    mMediaRecorder.setVideoFrameRate(profile.videoFrameRate); 
    mMediaRecorder.setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight); 

    // Step 4: Set output file 
    mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString()); 

    // Step 5: Set the preview output 
    mMediaRecorder.setPreviewDisplay(mPreview.getHolder().getSurface()); 

    // Step 6: Prepare configured MediaRecorder 
    try { 
     mMediaRecorder.prepare(); 
    } catch (IllegalStateException e) { 
     releaseMediaRecorder(); 
     return false; 
    } catch (IOException e) { 
     releaseMediaRecorder(); 
     return false; 
    } 
    return true; 
}