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• Screencasting with hardware-accelerated gnome-3 [closed]

  30 octobre 2012, par Jeroen

  I am running Ubuntu 12.04 with gnome 3 shell, and I would like to create a screencast. I have tried using recordMyDesktop, Kazam Screencaster, and ffmpeg but all suffer from the same problem, which I think has to do with hardware acceleration in Gnome 3. The recorded videos all get very glitchy with blue space for all operations that use some sort of effect. Here is an example recording : http://www.stat.ucla.edu/ jeroen/files/screencast.mkv.

  The only method that does not seem to suffer from this, is the (largely undocumented) CTRL+SHIFT+R shortcut in gnome 3 that will start a recording. However, this feature is very buggy otherwise and often crashes when I enable audio input.

  My machine has a GeForce GT 120 with Apple LED Cinema monitor. I am using the proprietary nvidia drivers that ship with Ubuntu 12.04. Is there any way I can record the video as it appears on my screen ? I know I can avoid the problem by switching to gnome2 or unity 2d or anything that does not use effects, but I would prefer to make the recordings in my regular gnome 3 environment.

• Running ffmpeg commands from android ffmpeg syntax error in logcat

  30 septembre 2015, par Chaitanya Chandurkar

  I have successfully compiled ffmpeg for android and have ported it.

  I placed

  1. libffmpeg.so in /system/lib directory
  2. ffmpeg executable in /system/bin and /system/xbin directory (i was not sure where to place it). i directly copied ffmpeg executable from source directory (Not sure whether it’s a correct way)

  Now i am executing commands from android with following code !!

  imports *
  
  public class LatestActivity extends Activity {
  
  
  
      private Process process;
  
      String command,text;
  
  
  
      static { 
  
          System.loadLibrary("ffmpeg");
  
      }
  
  
  
    @Override
  
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_latest);
  
  
  
            //Execute Command !!  
  
            try {
  
                 Execute();
  
            } catch (IOException e) {
  
                // TODO Auto-generated catch block
  
                e.printStackTrace();
  
            } catch (InterruptedException e) {
  
                 // TODO Auto-generated catch block
  
                  e.printStackTrace();
  
            }
  
       }
  
  
  
  
  
  
  
  
  
  public void Execute() throws IOException, InterruptedException{
  
          try {
  
              File dir=new File("/system/bin");
  
              String[] cmd= {"ffmpeg","-codecs"};
  
  
  
              process=Runtime.getRuntime().exec(cmd,null,dir);
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              Log.d("Process IOException starts:",e.getMessage());
  
              e.printStackTrace();
  
              Log.d("System Manual exit !!",e.getMessage());
  
              System.exit(MODE_PRIVATE);
  
          }
  
  
  
          BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()),16384);
  
  
  
           BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));
  
  
  
             // read the output from the command
  
             Log.d("Application output: ","Output if any !"); 
  
              while ((text = stdInput.readLine()) != null) {
  
                  Log.d("Output: ",text); //$NON-NLS-1$
  
                 }
  
  
  
  
  
          text="";
  
             // read any errors from the attempted command
  
          Log.d("Application output: ","Errors if any !");  //$NON-NLS-1$
  
             while ((text = stdError.readLine()) != null) {
  
  
  
                 Log.d("Error: ",text);  //$NON-NLS-1$
  
             }
  
  
  
  
  
  
  
             stdInput.close();
  
             stdError.close();
  
  
  
             process.waitFor();
  
             process.getOutputStream().close();
  
             process.getInputStream().close();
  
             process.getErrorStream().close(); 
  
             destroyProcess(process);
  
             //process.destroy();
  
  
  
      }
  
  
  
      private static void destroyProcess(Process process) {
  
          try {
  
              if (process != null) {
  
                  // use exitValue() to determine if process is still running.
  
                  process.exitValue();
  
              }
  
          } catch (IllegalThreadStateException e) {
  
              // process is still running, kill it.
  
              process.destroy();
  
          }
  
      }
  
  
  
    }

  And Here is the logcat output :

  09-05 15:29:13.287: D/dalvikvm(2670): No JNI_OnLoad found in /system/lib/libffmpeg.so 0x44e7e910, skipping init
  
  09-05 15:29:29.117: I/global(2670): Default buffer size used in BufferedReader constructor. It would be better to be explicit if an 8k-char buffer is required.
  
  09-05 15:29:29.117: D/Application output:(2670): Output if any !
  
  09-05 15:29:29.117: D/Application output:(2670): Errors if any !
  
  09-05 15:29:29.127: D/Error:(2670): /system/bin/ffmpeg: 1: Syntax error: "(" unexpected

  m neither getting any errors nor output of command.
  At the end it shows syntax error.
  I want to know what kind of syntax error it is. how to tackle it ?

  m i doing something wrong ?

• Extracting chinese subtitle from video

  19 novembre 2014, par william007

  Given a video like :
  https://www.youtube.com/watch?v=cNHeiIM5xZI

  Is there any library or tool that supports extraction of subtitle ?

  Extraction of subtitle in sequence would be sufficient, it would be plus if it can extracts the timestamp as well.