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• C# streaming drone video

  13 mars 2020, par jasonmacintosh

  I am currently a student and I have a project which require using the drone and the livestream from its camera

  I managed to find a control program http://www.winardrone.com which can control my ar drone 2.0 , but the problem is that the program doesn’t support my drone’s camera live stream method(TCP)due to the fact that the program is more compatible to the ar drone 1.0(older version drone) which uses(UDP)

  so I have encountered a problem of putting the video stream into my program
  ,there are a really simple solution of using ffmpeg player with cmd command "ffplay tcp ://192.168.1.1:5555", but it does mean that my program have to run in multiple windows and I won’t be able to save my frames with my program to do analyzation

  so could anyone tell me how to Stream my TCP video in my visual studio C# program and capture frames at the same time ?
  just like the program in this video
  https://www.youtube.com/watch?v=4V5B-DPWdOQ

  I wish to get the video image in a program instead of opening a new window

  And sorry for my bad grammar, thanks for your reply

• Non-monotonous DTS in output stream 0:0 during concatenation parts of the same video file

  7 février 2020, par user3841429

  I have a video file example.mp4, and text file concat.txt :

  file 'example.mp4'
  
  outpoint 422.719
  
  file 'example.mp4'
  
  inpoint 422.719
  
  outpoint 683.151
  
  file 'example.mp4'
  
  inpoint 688.151
  
  outpoint 1014.349
  
  file 'example.mp4'
  
  inpoint 1019.349

  I do :

  ffmpeg -f concat -i concat.txt -c copy -y out.mp4

  or

  ffmpeg -fflags +igndts -f concat -i concat.txt -c copy -y out.mp4

  And get set of errors in both cases :

  [mp4 @ 0x55a9a90ad980] Non-monotonous DTS in output stream 0:0;...
  
  [mp4 @ 0x55a9a90ad980] Non-monotonous DTS in output stream 0:0;...
  
  ...

  Also there are sound artifacts near the glue spots. They sound like beginning of the second part goes to the end of the first.

• Ffmpeg- Split video into 30 seconds parts in android

  22 novembre 2019, par Corgi Mogi

  I am working on a project. In which I want to split the video into 30 sec equal parts. If the video is 45 sec long than ideally in 30 and 15-sec parts. I already created a method which takes the starting and the ending point and run the Ffmpeg command to cut the video. This is what I created so far

     private void executeCutVideoCommand(int startMs, int endMs) {
  
          File moviesDir = Environment.getExternalStoragePublicDirectory(
  
                  Environment.DIRECTORY_MOVIES
  
          );
  
  
  
          String filePrefix = "cut_video";
  
          String fileExtn = ".mp4";
  
          String yourRealPath = getPath(VideoCutterActivity.this, selectedVideoUri);
  
          File dest = new File(moviesDir, filePrefix + fileExtn);
  
          int fileNo = 0;
  
          while (dest.exists()) {
  
              fileNo++;
  
              dest = new File(moviesDir, filePrefix + fileNo + fileExtn);
  
          }
  
  
  
          filePath = dest.getAbsolutePath();
  
          String[] complexCommand = {"-ss", "" + startMs / 1000, "-y", "-i", yourRealPath, "-t", "" + (endMs - startMs) / 1000,"-vcodec", "mpeg4", "-b:v", "2097152", "-b:a", "48000", "-ac", "2", "-ar", "22050", filePath};
  
  
  
          execFFmpegBinary(complexCommand);
  
          MediaScannerConnection.scanFile(VideoCutterActivity.this,
  
                  new String[] { filePath },
  
                  null,
  
                  new MediaScannerConnection.OnScanCompletedListener() {
  
  
  
                      public void onScanCompleted(String path, Uri uri) {
  
  
  
                          Log.i("ExternalStorage", "Scanned " + path + ":");
  
                          Log.i("ExternalStorage", "-> uri=" + uri);
  
                      }
  
                  });
  
  
  
  
  
      }
  
  
  
      /**
  
       * Executing ffmpeg binary
  
       */
  
      private void execFFmpegBinary(final String[] command) {
  
          try {
  
              ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
                  @Override
  
                  public void onFailure(String s) {
  
                      Log.d(TAG, "FAILED with output : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onSuccess(String s) {
  
                      Log.d(TAG, "SUCCESS with output : " + s);
  
                          Intent intent = new Intent(VideoCutterActivity.this, PreviewActivity.class);
  
                          intent.putExtra(FILEPATH, filePath);
  
                          startActivity(intent);
  
                  }
  
  
  
                  @Override
  
                  public void onProgress(String s) {
  
                      progressDialog.setMessage("progress : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
                      progressDialog.setMessage("Processing...");
  
                      progressDialog.show();
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      progressDialog.dismiss();
  
  
  
  
  
                  }
  
              });
  
          } catch (FFmpegCommandAlreadyRunningException e) {
  
              // do nothing for now
  
          }
  
      }

  i tried to add a loop in method Calling But than app crashes

      cutVideo.setOnClickListener(new View.OnClickListener() {
  
              @Override
  
              public void onClick(View v) {
  
  
  
                  choice = 2;
  
  
  
                  if (selectedVideoUri != null) {
  
                      int start,end;
  
                      for (int i=0;i<=duration;i=i+30){
  
                          start=i;
  
                          end=start+30;
  
                          executeCutVideoCommand(start,end);
  
  
  
                      }
  
  //                    executeCutVideoCommand(rangeSeekBar.getSelectedMinValue().intValue() * 1000, rangeSeekBar.getSelectedMaxValue().intValue() * 1000);
  
  
  
                  } else
  
                      Snackbar.make(mainlayout, "Please upload a video", 4000).show();
  
              }
  
          });
  
  
  
  
  
      }

  I hope now you can what i want to do. I want to Ffmpeg command or method which split the video into 30-sec parts and place them on the given filepath. Let me know if we you wanna know more about the code. Help is much appreciated