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• Adjust video capture input port using C++ / python

  19 juillet 2017, par Tarek

  I am having a video capture device (VCD) that acquires frames from a TV which have various output ports (VGA, HDMI, DVI). I read these frames using C++/OpenCV, process them and then show the output on a C++/Qt QLabel.

  My problems show up when I change the input port (DVI to HDMI or HDMI to VGA,...), at then I need to manually open the crossbar dialog window for the VCD and switch the input port.

  Shows command window with ffmpeg command line + crossbar window for the video capture device

  

  Moreover, for each input port, I need to adjust some parameters relating to color range, scaling size and wire’s length.

  I need to automate this process of selecting the right input port with the corresponding right parameters using a C++ or python code.

  I was searching for a way to read all the input pins of the crossbar dialog box for the video capture device and this set/unset the required pins.

  Thanks in advance.

• Summer Hacking 2011

  28 avril 2011, par Multimedia Mike — General

  I recently learned that iD — you know, the famed game company — has a series of summer tech camps :

  
  
  

  All I care to know is : Where were programs like these when I was 7-18 years old ? Born too early, I tell ya.

  That reminds me that the Google Summer of Code, 2011 Edition is getting underway soon. I guess it’s like summertime computer camp for college-aged students. FFmpeg / libav is once again a part of the program with 10 slots awarded by Google. Here are the students, projects, and mentors.

  Wish them luck.

• Killing cmd processes in Bravobit FFmpeg

  10 octobre 2018, par kataroty

  I am using Bravobit FFmpeg Bravobit FFmpeg github to convert some audio files. There are more convertion than these 2 but I do not think they are necessary to add here.

  My question is, is it possible to kill or stop these commands once they are started.

  At the moment when I start the first method convertPCMToWav() and then call finish() in the Main method which stops all other processes but these. They just keep on going like nothing has happened.

  public class AudioProcessor {
  
  
  
      private Context context;
  
      private FFmpeg ffmpeg;
  
  
  
      private File micPcmFile;
  
  
  
      private File pcmtowavTempFile;
  
      private File mp3towavTempFile;
  
  
  
      public AudioProcessor(Context context, Activity activity) {
  
          ffmpeg = null;
  
          ffmpeg = FFmpeg.getInstance(context);
  
          this.context = context;
  
          prepare();
  
      }
  
  
  
      /**
  
       * Program main method. Starts running program
  
       * @throws Exception
  
       */
  
      public void process() throws Exception {
  
          if (!ffmpeg.isSupported()) {
  
              Log.e("AudioProcessor", "FFMPEG not supported! Cannot convert audio!");
  
              throw new Exception("FFMPeg has to be supported");
  
          }
  
          if (!checkIfAllFilesPresent()) {
  
              Log.e("AudioProcessor", "All files are not set yet. Please set file first");
  
              throw new Exception("Files are not set!");
  
          }
  
  
  
          Log.e("AudioProcessor", "Start processing audio");
  
  
  
  
  
  
  
  
  
          Handler handler = new Handler();
  
          handler.postDelayed(new Runnable() {
  
              @Override
  
              public void run() {
  
                  convertPCMToWav();
  
              }
  
          }, 200);
  
      }
  
  
  
      /**
  
       * Prepares program
  
       */
  
      private void prepare() {
  
          prepareTempFiles();
  
      }
  
  
  
      /**
  
       * Converts PCM to wav file. Automatically create new file.
  
       */
  
      private void convertPCMToWav() {
  
          String[] cmd = { "-f" , "s16le", "-ar", "44.1k", "-i", micPcmFile.toString(), "-y", pcmtowavTempFile.toString()};
  
          ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  super.onStart();
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  super.onSuccess(message);
  
                  convertMP3ToWav();
  
              }
  
              @Override
  
              public void onFailure(String message) {
  
                  super.onFailure(message);
  
              }
  
          });
  
      }
  
  
  
      /**
  
       * Converts mp3 file to wav file.
  
       * Creates Wav file
  
       */
  
      private void convertMP3ToWav() {
  
          String[] cmd = { "-i" , backgroundMp3File.toString(), "-y", mp3towavTempFile.toString() };
  
          ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {
  
              @Override
  
              public void onStart() {
  
                  super.onStart();
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  super.onSuccess(message);
  
                  changeMicAudio();
  
              }
  
              @Override
  
              public void onFailure(String message) {
  
                  super.onFailure(message);
  
  
  
              }
  
          });
  
      }
  
  
  
     /**
  
       * Prepares temp required files by deleteing them if they exsist.
  
       * Files cannot exists before ffmpeg actions. FFMpeg automatically creates those files.
  
       */
  
      private void prepareTempFiles() {
  
          pcmtowavTempFile = new File(context.getFilesDir()+ Common.TEMP_LOCAL_DIR + "/" + "_pcm.wav");
  
          mp3towavTempFile = new File(context.getFilesDir()+ Common.TEMP_LOCAL_DIR + "/" + "_mp3.wav");   
  
          destroyTempFiles();
  
      }
  
  
  
     /**
  
       * Destroys temp required files
  
       */
  
       private void destroyTempFiles() {
  
  
  
           pcmtowavTempFile.delete();
  
           mp3towavTempFile.delete();
  
      }
  
  
  
  }