如何在 android 中使用 Mediaprojection 库捕获屏幕并转换为 mp4 文件？

Question

从 android 5.0 开始，他们提供了 mediaprojection 库来捕获屏幕内容。但他们提供的示例演示应用程序尚不清楚。你可以找到示例应用程序here。在该应用程序中，他们使用 virtualdisplay 方法投影捕获的屏幕

private void setUpVirtualDisplay() {
    Log.i(TAG, "Setting up a VirtualDisplay: " +
            mSurfaceView.getWidth() + "x" + mSurfaceView.getHeight() +
            " (" + mScreenDensity + ")");
    mVirtualDisplay = mMediaProjection.createVirtualDisplay("ScreenCapture",
            mSurfaceView.getWidth(), mSurfaceView.getHeight(), mScreenDensity,
            DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
            mSurface, null, null);
    mButtonToggle.setText(R.string.stop);
}

我想将捕获的屏幕转换为我的屏幕录制应用程序的 mp4 文件。请帮我解决这个问题。

Answer 1

这里是示例代码参考from

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private static final int PERMISSION_CODE = 1;
    private int mScreenDensity;
    private MediaProjectionManager mProjectionManager;
    private static final int DISPLAY_WIDTH = 480;
    private static final int DISPLAY_HEIGHT = 640;
    private MediaProjection mMediaProjection;
    private VirtualDisplay mVirtualDisplay;
    private MediaProjectionCallback mMediaProjectionCallback;
    private ToggleButton mToggleButton;
    private MediaRecorder mMediaRecorder;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        mScreenDensity = metrics.densityDpi;

        mMediaRecorder = new MediaRecorder();
        initRecorder();
        prepareRecorder();

        mProjectionManager = (MediaProjectionManager) getSystemService
                (Context.MEDIA_PROJECTION_SERVICE);

        mToggleButton = (ToggleButton) findViewById(R.id.toggle);
        mToggleButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onToggleScreenShare(v);
            }
        });

        mMediaProjectionCallback = new MediaProjectionCallback();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mMediaProjection != null) {
            mMediaProjection.stop();
            mMediaProjection = null;
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode != PERMISSION_CODE) {
            Log.e(TAG, "Unknown request code: " + requestCode);
            return;
        }
        if (resultCode != RESULT_OK) {
            Toast.makeText(this,
                    "Screen Cast Permission Denied", Toast.LENGTH_SHORT).show();
            mToggleButton.setChecked(false);
            return;
        }
        mMediaProjection = mProjectionManager.getMediaProjection(resultCode, data);
        mMediaProjection.registerCallback(mMediaProjectionCallback, null);
        mVirtualDisplay = createVirtualDisplay();
        mMediaRecorder.start();
    }

    public void onToggleScreenShare(View view) {
        if (((ToggleButton) view).isChecked()) {
            shareScreen();
        } else {
            mMediaRecorder.stop();
            mMediaRecorder.reset();
            Log.v(TAG, "Recording Stopped");
            stopScreenSharing();
            initRecorder();
            prepareRecorder();
        }
    }

    private void shareScreen() {
        if (mMediaProjection == null) {
            startActivityForResult(mProjectionManager.createScreenCaptureIntent(), PERMISSION_CODE);
            return;
        }
        mVirtualDisplay = createVirtualDisplay();
        mMediaRecorder.start();
    }

    private void stopScreenSharing() {
        if (mVirtualDisplay == null) {
            return;
        }
        mVirtualDisplay.release();
        //mMediaRecorder.release();
    }

    private VirtualDisplay createVirtualDisplay() {
        return mMediaProjection.createVirtualDisplay("MainActivity",
                DISPLAY_WIDTH, DISPLAY_HEIGHT, mScreenDensity,
                DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
                mMediaRecorder.getSurface(), null /*Callbacks*/, null /*Handler*/);
    }

    private class MediaProjectionCallback extends MediaProjection.Callback {
        @Override
        public void onStop() {
            if (mToggleButton.isChecked()) {
                mToggleButton.setChecked(false);
                mMediaRecorder.stop();
                mMediaRecorder.reset();
                Log.v(TAG, "Recording Stopped");
                initRecorder();
                prepareRecorder();
            }
            mMediaProjection = null;
            stopScreenSharing();
            Log.i(TAG, "MediaProjection Stopped");
        }
    }

    private void prepareRecorder() {
        try {
            mMediaRecorder.prepare();
        } catch (IllegalStateException e) {
            e.printStackTrace();
            finish();
        } catch (IOException e) {
            e.printStackTrace();
            finish();
        }
    }

    private void initRecorder() {
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mMediaRecorder.setVideoEncodingBitRate(512 * 1000);
        mMediaRecorder.setVideoFrameRate(30);
        mMediaRecorder.setVideoSize(DISPLAY_WIDTH, DISPLAY_HEIGHT);
        mMediaRecorder.setOutputFile("/sdcard/capture.mp4");
    }
}

Answer 2

您将 Surface 从 SurfaceView 传递到 createVirtualDisplay()。将其替换为 Surface from a MediaRecorder。

Answer 3

看看这个POST。关于如何使用 MediaProjection API 将屏幕实际录制到外部存储上的 mp4 文件有一个很好的解释。此解决方案使用 MediaRecorder 来存储视频。

您可以在Matt Snider的页面上找到另一个解决方案。 MediaMuxer 用于将视频存储到外部存储中。但请注意，MediaMuxer 的输出不可流式传输。