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Android mediarecoder saves empty file

This is the code that I used to record video from an Android device in MP4 format. The file is created, but has a size of 0 bytes. I don’t seem to understand what went wrong. Any help would be appreciated.

if(mCamera == null) { mCamera = Camera.open(); mCamera.unlock(); } if(mediaRecorder == null) mediaRecorder = new MediaRecorder(); mediaRecorder.setCamera(mCamera); mediaRecorder.setCamera(mCamera); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); mediaRecorder.setMaxDuration(maxDurationInMs); mediaRecorder.setOutputFile("/sdcard/1.mp4"); mediaRecorder.setVideoFrameRate(videoFramesPerSecond); mediaRecorder.setVideoSize(176,144); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); mediaRecorder.setPreviewDisplay(surface); mediaRecorder.setMaxFileSize(maxFileSizeInBytes); mediaRecorder.prepare(); try { mediaRecorder.prepare(); } catch (IllegalStateException e) { // This is thrown if the previous calls are not called with the // proper order e.printStackTrace(); } mediaRecorder.start();
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5 answers

okay, so I finally figured it out myself. I used the method described here and it worked correctly.

http://developer.android.com/guide/topics/media/camera.html#saving-media

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The reason for this behavior is that you are probably (95% sure) calling recorder.setOutputFile() again after you finished recording (maybe after recorder.stop() ). Thus, the old file is overwritten with a new empty file.

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The code below worked for me:

  private boolean isRecording = false; public static final int MEDIA_TYPE_IMAGE = 1; public static final int MEDIA_TYPE_VIDEO = 2; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_video_record); // Create an instance of Camera mCamera = getCameraInstance(); mHolder = surfaceViewRecReadyTestimonial.getHolder(); mHolder.addCallback(this); mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public static Camera getCameraInstance() { Camera c = null; try { c = Camera.open(); // attempt to get a Camera instance } catch (Exception e) { // Camera is not available (in use or does not exist) } return c; // returns null if camera is unavailable } private boolean prepareVideoRecorder() { mCamera = getCameraInstance(); 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(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH)); // Step 4: Set output file mMediaRecorder.setOutputFile(getOutputMediaFile(MEDIA_TYPE_VIDEO).toString()); // Step 5: Set the preview output mMediaRecorder.setPreviewDisplay(surfaceViewRecReadyTestimonial.getHolder().getSurface()); // Step 6: 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; } @Override public void onClick(View v) { if (v == btnStart) { // initialize video camera if (prepareVideoRecorder()) { // Camera is available and unlocked, MediaRecorder is prepared, // now you can start recording mMediaRecorder.start(); // inform the user that recording has started isRecording = true; } else { // prepare didn't work, release the camera releaseMediaRecorder(); // inform user } } else if (v == btnStop) { if (isRecording) { // stop recording and release camera mMediaRecorder.stop(); // stop the recording releaseMediaRecorder(); // release the MediaRecorder object mCamera.lock(); // take camera access back from MediaRecorder // inform the user that recording has stopped isRecording = false; } } } private void releaseMediaRecorder() { if (mMediaRecorder != null) { mMediaRecorder.reset(); // clear recorder configuration mMediaRecorder.release(); // release the recorder object mMediaRecorder = null; mCamera.lock(); // lock camera for later use } } private void releaseCamera() { if (mCamera != null) { mCamera.release(); // release the camera for other applications mCamera = null; } } /** * Create a File for saving an image or video */ private static File getOutputMediaFile(int type) { // To be safe, you should check that the SDCard is mounted // using Environment.getExternalStorageState() before doing this. File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_DCIM), "FolderName"); // This location works best if you want the created images to be shared // between applications and persist after your app has been uninstalled. // Create the storage directory if it does not exist if (!mediaStorageDir.exists()) { if (!mediaStorageDir.mkdirs()) { Log.d("FolderName", "failed to create directory"); return null; } } // Create a media file name String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); File mediaFile; if (type == MEDIA_TYPE_IMAGE) { mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg"); } else if (type == MEDIA_TYPE_VIDEO) { mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_" + timeStamp + ".mp4"); } else { return null; } return mediaFile; } @Override protected void onPause() { super.onPause(); releaseMediaRecorder(); // if you are using MediaRecorder, release it first releaseCamera(); // release the camera immediately on pause event } @Override public void surfaceCreated(SurfaceHolder holder) { // The Surface has been created, now tell the camera where to draw the preview. try { mCamera.setPreviewDisplay(holder); mCamera.startPreview(); } catch (IOException e) { Log.d("RecordVideo", "Error setting camera preview: " + e.getMessage()); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // If your preview can change or rotate, take care of those events here. // Make sure to stop the preview before resizing or reformatting it. if (mHolder.getSurface() == null) { // preview surface does not exist return; } // stop preview before making changes try { mCamera.stopPreview(); } catch (Exception e) { // ignore: tried to stop a non-existent preview } try { Camera.Parameters parameters = mCamera.getParameters(); Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay(); if (display.getRotation() == Surface.ROTATION_0) { parameters.setPreviewSize(height, width); mCamera.setDisplayOrientation(90); } if (display.getRotation() == Surface.ROTATION_90) { parameters.setPreviewSize(width, height); } if (display.getRotation() == Surface.ROTATION_180) { parameters.setPreviewSize(height, width); } if (display.getRotation() == Surface.ROTATION_270) { parameters.setPreviewSize(width, height); mCamera.setDisplayOrientation(180); } if (mCamera != null) { try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } catch (Exception e) { e.printStackTrace(); } // set preview size and make any resize, rotate or // reformatting changes here // start preview with new settings try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (Exception e) { Log.d(TAG, "Error starting camera preview: " + e.getMessage()); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { }
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 public static final String rootDir = getStorageDir().concat(yours_dir); ... mediaRecorder.setOutputFile(rootDir);
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Is user permission set

 <uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.RECORD_AUDIO" />
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Source: https://habr.com/ru/post/910457/

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