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• How to send a string to ffmpeg's input in Java

  19 décembre 2019, par jdauthre

  I am quite new to java, and try as I might, I can’t find any examples to help me. I am running ffmpeg as a process and parsing the stderr to get various bits of data - all of which is working fine, but I want to send a "q\n" command to ffmpeg’s input from a gui menu item to gracefully quit it whilst it is running when necessary. So all I want to do is send a string programmatically to ffmpeg, the equivalent of sending q return from terminal. Thanks in advance
  edit here is the relevant (simplified) section of the code

   private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                 Thread thread = new Thread() {
  
  
  
  public void run()
  
  BufferedReader error_reader,input_reader;
  
  InputStreamReader error_isr,input_isr;
  
  
  
  String ffmpeg_command = "ffmpeg " + overwrite + " -i " + "\"" + currentfilestring + "\"" + " " + stream + " " + test + " " + findsilence + " " + videocodec + " -b:v " + videoqual + " " + audiocodec + " -ac 2  -ab " + audioqual + " " + res + " " + aspectratio + " " + framerate + " " + "\"" + destdir + destfile + "\"";
  
  System.out.println(ffmpeg_command);
  
  try {
  
  OutputStream stdout;
  
  InputStream stdin;
  
  InputStream stderr;
  
  String errorstr,inputstr;
  
  //Run the ffmpeg
  
  Process ffmpeg = Runtime.getRuntime().exec(ffmpeg_command, null, new File(userDir));
  
  
  
  //Get stdin,stderr + stdout                     
  
  stdin = ffmpeg.getInputStream();
  
  stderr = ffmpeg.getErrorStream();
  
  stdout = ffmpeg.getOutputStream();
  
  stdout.write("\r\n".getBytes());   
  
  stdout.flush();
  
  stdout.close();
  
  
  
  error_isr = new InputStreamReader(stderr);
  
  error_reader = new BufferedReader(error_isr);
  
  
  
  input_reader = new BufferedReader(input_isr);
  
  while (!error_reader.ready()) {
  
  }
  
  while ((errorstr = error_reader.readLine()) != null) {
  
  
  
  if(stopconv =="yes"){
  
                              //-------------------------------------------------------------------------------------
  
                                 // TRYING TO INPUT "q\n" TO FFMPEG HERE
  
                 //-------------------------------------------------------------------------------------
  
   }
  
  
  
   error_isr.close();
  
   error_reader.close();
  
   stdin.close();
  
   stderr.close();
  
   jProgressBar1.setValue(0);
  
  
  
   ffmpeg.destroy();
  
  
  
   } catch (Exception e) {
  
   e.printStackTrace();
  
                          }
  
  };
  
  thread.start();
  
  }                             

• avformat/mpeg : Don't copy or leak string in AVBPrint

  4 décembre 2019, par Andreas Rheinhardt

  avformat/mpeg : Don't copy or leak string in AVBPrint
  vobsub_read_header() uses an AVBPrint to write a string and up until
  
  now, it collected the string stored in the AVBPrint via
  
  av_bprint_finalize(), which might involve an allocation and copy of the
  
  string. But this is unnecessary, as the lifetime of the returned string
  
  does not exceed the lifetime of the AVBPrint. So use the string in the
  
  AVBPrint directly.
  This also makes it possible to easily fix a memleak : In certain error
  
  situations, the string stored in the AVBPrint would not be freed (if it
  
  was dynamically allocated). This has been fixed, too.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mpeg.c

• FFmpeg doesn't work on android 10, goes strait to onFailure(String message) with empty message

  18 janvier 2020, par nolanic

  I’m using FFmpeg in one of my projects for video compression. On Android 10 (Google Pixel 3a), it goes straight to onFailure(String message) with empty message for any command sent for execution.

  so I have (api ’com.writingminds:FFmpegAndroid:0.3.2’) specified in my app gradle file,

  permission (android.permission.WRITE_EXTERNAL_STORAGE) in the manifest is specified

  So I do :

  InitializationCallback initializationCallback = new InitializationCallback();
  
      try {
  
          FFmpeg.getInstance(context).loadBinary(initializationCallback);
  
      } catch (FFmpegNotSupportedException e) {
  
          initializationCallback.onFailure();
  
          initializationCallback.onFinish();
  
      }

  Initializes just fine, no problems here.

  Later :

  void getData(File inputFile) {
  
  //inputFile points to: /storage/emulated/0/Android/data/{package_name}/files/temp_files/temp_1.mp4
  
          String[] cmd = ("-i " + inputFile.getAbsolutePath()).split(" ");
  
          try {
  
              FFmpeg.getInstance(App.instance).execute(cmd, this);
  
          } catch (FFmpegCommandAlreadyRunningException e) {
  
              throw new Error(e);
  
          }
  
      }
  
  
  
      @Override
  
      public void onStart() {
  
           //This method is called
  
      }
  
  
  
      @Override
  
      public void onSuccess(String message) {
  
           //This method is NOT called
  
           extractAvailableData(message);
  
      }
  
  
  
      @Override
  
      public void onProgress(String message) {
  
          //This method is NOT called
  
          extractAvailableData(message);
  
      }
  
  
  
      @Override
  
      public void onFailure(String message) {
  
          //This method is called and the message is empty
  
          extractAvailableData(message);
  
      }
  
  
  
      @Override
  
      public void onFinish() {
  
          //This method is called
  
      }

  If I do something like :

  String command = "-i ***/file1.mp4 -map 0:v -map 0:a -preset ultrafast -s:v 750:350 ***/file2.mp4";
  
  //file2.mp4 is a non existent file at this point
  
  // (***) --> is just a replacement for the full path of the file, just to keep things shorter here.
  
  
  
  String[] cmd = command.split(" ");
  
          try {
  
              FFmpeg.getInstance(App.instance).execute(cmd, this);
  
          } catch (FFmpegCommandAlreadyRunningException e) {
  
              throw new Error(e);
  
          }

  gives the same result, no video conversion, just a call to onFailure("Nothing")

  Even if I do :

  String[] cmd = {"-version"};
  
          try {
  
              FFmpeg.getInstance(App.instance).execute(cmd, this);
  
          } catch (FFmpegCommandAlreadyRunningException e) {
  
              throw new Error(e);
  
          }

  I get nothing, no output at all.

  I encountered this issue only on Android 10 so far, it works fine on other devices.