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• avconv / ffmpeg webcam capture while using minimum CPU processing

  10 septembre 2015, par user3585723

  I have a question about avconv (or ffmpeg) usage.

  My goal is to capture video from a webcam and saving it to a file.
  Also, I don’t want to use too much CPU processing. (I don’t want avconv to scale or re-encode the stream)

  So, I was thinking to use the compressed mjpeg video stream from the webcam and directly saving it to a file.

  My webcam is a Microsoft LifeCam HD 3000 and its capabilities are :

  ffmpeg -f v4l2 -list_formats all -i /dev/video0
  
  
  
  Raw: yuyv422 : YUV 4:2:2 (YUYV) : 640x480 1280x720 960x544 800x448 640x360 424x240 352x288 320x240 800x600 176x144 160x120 1280x800
  
  
  
  Compressed: mjpeg : MJPEG : 640x480 1280x720 960x544 800x448 640x360 800x600 416x240 352x288 176x144 320x240 160x120

  What would be the avconv command to save the Compressed stream directly without having avconv doing scaling or re-encoding.

  For now, I am using this command :

  avconv -f video4linux2 -r 30 -s 320x240 -i /dev/video0 test.avi

  I’m not sure that this command is CPU efficient since I don’t tell anywhere to use the mjpeg Compressed capability of the webcam.

  Is avconv taking care of the configuration of the webcam setting before starting to record the file ? Is it always working of raw stream and doing scaling and enconding on the raw stream ?

  Thanks for your answer

• FFMPEG Command line for producing video for Tivo S3 and S4 RSS feed functionality

  16 décembre 2015, par user793586

  I have been trying to generate a solid video/audio ffmpeg command line configuration that will produce an HD quality video. The output needs to play on both the Tivo S3 and S4 boxes using the RSS vod feature. The following settings are required.

  Video :

  Multiplexer type : MPEG-4 System

  Video Dimension : 1280 x 720

  Aspect Ratio : 16:9

  Frame Rate : 29.97fps

  Interlacing : Non-Interlaced

  Bite Rate Mode : VBR

  Number of passes : 2

  Video Bitrate : 3000 kbps

  Maximum Bitrate : 8000 kbps

  Profile : Main

  Level : 3.2

  Number of B-Pictures : 2

  Audio :

  Audio Stream Type : AAC

  Bits / Sample : 16

  Channels : Stereo

  Sample Rate : 48K

  Audio Bitrate : 128 kbps

• i want make a video from list of bitmaps by ffmpegframerecorder

  3 mars 2016, par Muhammad Nasser

  this code to record images from sdcard i want to get the frames from array of bitmaps.

  new AsyncTask() {
  
              ProgressDialog dialog;
  
              protected void onPreExecute() {
  
                  dialog = new ProgressDialog(MainActivity.this);
  
                  dialog.setMessage("Genrating video, Please wait.........");
  
                  dialog.setCancelable(false);
  
                  dialog.show();
  
              };
  
  
  
              @Override
  
              protected Void doInBackground(Void... arg0) {
  
  
  
                  File folder = Environment
  
                          .getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
  
                  String path = folder.getAbsolutePath() + "/Camera";
  
                  ArrayList<string> paths = (ArrayList<string>) getListOfFiles(
  
                          path, "jpg");
  
                  FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(path
  
                          + "/" + "test.mp4", 400, 400);
  
                  videoPath = path + "/" + "test.mp4";
  
                  try {
  
                      //recorder.setVideoCodec(5);
  
                      recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4);
  
                      //recorder.setFormat("3gp");
  
                      recorder.setFormat("mp4");
  
                      recorder.setFrameRate(frameRate);
  
                      recorder.setVideoBitrate(30);
  
                      startTime = System.currentTimeMillis();
  
                      recorder.start();
  
                      for (int i = 0; i " + paths.get(i));
  
                          long t = 3000 * (System.currentTimeMillis() - startTime);
  
                          if (t > recorder.getTimestamp()) {
  
                              recorder.setTimestamp(t);
  
                              recorder.record(image);
  
                          }
  
                      }
  
                      System.out.println("Total Time:- " + recorder.getTimestamp());
  
                      recorder.stop();
  
                  } catch (Exception e) {
  
                      e.printStackTrace();
  
                  }
  
  
  
                  return null;
  
              }
  
  
  
              protected void onPostExecute(Void result) {
  
                  dialog.dismiss();
  
                  Intent intent = new Intent(Intent.ACTION_VIEW); 
  
                  intent.setDataAndType(Uri.parse(videoPath), "video/mp4");
  
                  startActivity(intent);
  
                  File file = new File(selectedFilePath);
  
                  boolean deleted = file.delete();
  
                  Toast.makeText(MainActivity.this, "Done", Toast.LENGTH_SHORT)
  
                          .show();
  
              };
  
          }.execute();
  
  </string></string>