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• Writing Live-Multimedia-Application using OpenGL & Co. saving output to disc [closed]

  21 janvier 2013, par user1997286

  I want to write an application that does the following thing :

  • Getting Commands via ArtNET (DMX over Ethernet, a Control Protocol) for each object (called Layer)
  • each Layer could be one of the following : Live Camera Stream, Movie, Image
  • each layer could be translated, rotated or stretched
  • on each layer I can set filters (Like a Kaleidoscope Effect, Blur, Color Correction, etc.)
  • the rsulting video-stream is in the 3d-space
  • I want to display each part of the image on one Projector (in total up to 3 ones) using a TripleHead2GO (3 Projectors display a different region of my DVI-Output). Each Projecector-Image should have own Soft-Edge and Keystone parameters.
  • the resulting image will also be shown on a Preview-Screen with some Information overlay.

  I think all that should be possible with opengl and openal (for the movie audio)

  I think I'll use C++, OpenGL for Graphics, OpenAL for Audio, if needed ffmpeg for Video conversion, Ubuntu/Debian as OS.

  The software is used to do Multimedia-Shows on Concerts including Cameras & Co.

  All that should happen Live (On a FullHD output), Having i7 3770, GLX 670 and 16GB of Ram for at least 8 Layers. (4 Live-Images at once + Some Overlays like the Actors Name and some Logos)

  But now comes the question.

  Is it also Posible to do the following with that setting :

  • Writing the output Image with all the 3d translations to a Movie File (To Master a DVD later) with Audio
  • Mixing Audio from different Inputs & Files (Ambience Mics, Signal from the Sound Mixer, Playbacks from my own application) to more than one Mix (eg. one Mix for the Recording, one Mix for Live)
  • Stream that Output Complete or in Parts (e.g. the left Part of the Image) over the Network (For example, Projector 1 is near the Server, so I connect it using DVI, Projector 2+3 is connected to a Computer that receives the streams for that two projectors (with soft edge on each stream) and Screen 4 is outside the Concert Hall and shows the complete Live-Stream.
  • What GUI-Framework should I use for that ?
  • is it perhaps event performant enough to use Java for that ?
  • is it posible to use that mechanism for just rendering (eg. I have stored the cut points on Disc and saved every single camera stream to change some errors later or cut out some parts)

• A blocked external process in a swing GUI

  27 décembre 2012, par user1932255

  I am developing an encoder with java swing and ffmpeg. I created a GUI interface in which I specify my inputs (devices, frame rate, bitrate..). Then I call ffmpeg to encode and stream.

  My problem is that the encoding class is well executed from a main class but it is blocked when called from the swing interface (specifically jButtonactionperformed()).

  Can anyone help me ?

  here is my button action

  private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
  
      Encode s = new Encode();
  
      s.Encode(cmdLine);
  
  }

  and here is my encoding method

  public void Encode(String cmdLine) {
  
      try {
  
          Process p2 = Runtime.getRuntime().exec(cmdLine);
  
          //logProcessOutputAndErrors(p2); 
  
      }
  
      catch(Exception ex) {
  
          ex.printStackTrace();
  
      }
  
  }

  Ps : Cmdline is the command i collect from inputs

• reading ffmpeg output and sending it to a form

  3 juillet 2013, par Aeon2058

  I can run arguments through ffmpeg just fine, but I need to be able to read its output LIVE as it streams (as you may know, ffmpeg can take a while, and it updates its stderr twice a second with current frame, etc).

  I have a form called prog that was declared globally with ProgressForm prog = new ProgressForm(); The user inputs a folder of video files, some data is gathered, and then a button is pushed to start the encoding process with ffmpeg. The button_click event creates a new thread like so :

   runFFMpeg = new Thread(run_ffmpeg);
  
   runFFMpeg.start();

  runFFMpeg was initialized globally earlier with private Thread runFFMpeg;.

  Now I have the method run_ffmpeg :

  private void run_ffmpeg()
  
  {
  
      string program = "C:\\ffmpeg64.exe";
  
      string args = //some arguments that I know work;
  
  
  
      ProcessStartInfo run = new ProcessStartInfo(program,args);
  
      run.UseShellExecute = false;
  
      run.CreateNoWindow = true;
  
      run.RedirectStandardOutput = true;
  
      run.RedirectStandardError = true;
  
      Process runP = new Process();
  
      runP = Process.Start(run);
  
      runP.WaitForExit();
  
  
  
      //NOW WHAT?
  
  
  
   }

  I'm not sure what to do now to get the data LIVE, but if I can, I would be updating prog, which has a number of controls, including progress bars, etc. Typical output (that I'm interested in) looks like "frame= 240 fps= 12.8 q=0.0 size= 1273802kB time=00:00:08.008 bitrate=4415.2kbits/s dup=46 drop=0". I know how to parse that to get what I need, I just need that line !