Android record video without audio

问题

Is it possible in Android to record video from Camera without audio stream?

Goal: to reduce the output file size.

回答1:

You can use a MediaRecorder without calling setAudio* on it. This is my first time using MediaRecorder, but this example seems to work:

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();

    }
}

You may also want to call:

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

回答2:

You can prepare MediaRecorder by copying the required fields from inbuilt profile (CamcorderProfile). Just leave out the audio settings and you should be good to go. Edit code below for your needs, step 3 is the essential part here.

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;
}

来源：https://stackoverflow.com/questions/11920898/android-record-video-without-audio