Android preview processing while video recording

Question

I am using Android development (SDK 2.2) and I would like to make a video recording with mediaRecorder and, at the same time, do some process on each preview fr

Answer 1

You just add tag to your manifest file .Thus it will work.Sample code shown below.

eg:-

   </application>
    <uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.RECORD_VIDEO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    ***<uses-feature android:name="android.hardware.camera" />***
</manifest>

Answer 2

you cannot access the video stream while recording, onPreviewFrame will not get called once you start recording. Oddly, onPreviewFrame does not seem to get called after you record either...

Answer 3

Eureka! The trick is to attach your PreviewCallback in the surfaceChanged(...) SurfaceHolder.Callback! After doing this, you'll continue to get preview frame data after a MediaRecorder is running!

For example:

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    mCamera.setPreviewCallback(new PreviewCallback() {
            public void onPreviewFrame(byte[] _data, Camera _camera) {
                Log.d("onPreviewFrame-surfaceChanged",String.format("Got %d bytes of camera data", _data.length));
            }
        });

}

Answer 4

if you are using os 2.2 or higher then use this method your prepare failed and other exception will removed

 public boolean startRecording() {
    try {
        camera.unlock();

        mediaRecorder = new MediaRecorder();
        mediaRecorder.setCamera(camera);
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mediaRecorder.setProfile(CamcorderProfile
                .get(CamcorderProfile.QUALITY_HIGH));

        File tempFile = new File(getOutputMediaFile(MEDIA_TYPE_VIDEO)
                .toString());

        mediaRecorder.setOutputFile(tempFile.getPath());
        mediaRecorder.setVideoFrameRate(videoFramesPerSecond);
        mediaRecorder.setVideoSize(surfaceView.getWidth(),
                surfaceView.getHeight());
        mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
        mediaRecorder.setMaxFileSize(maxFileSizeInBytes);
        mediaRecorder.prepare();
        mediaRecorder.start();

        return true;
    } catch (IllegalStateException e) {
        Log.e(TAG, e.getMessage());
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        Log.e(TAG, e.getMessage());
        e.printStackTrace();
        return false;
    }
}