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• FFmpeg video creation getting stuck while executed from java

  14 août 2016, par user11230

  I am using this line of code to create a simple video from an image.

  ffmpeg -framerate 1/5 -i C:\mydir\img.jpg -c:v libx264 -r 30 -pix_fmt yuv420p test2.mp4

  it works flawlessly if I execute it from the cmd. But if I call it from my java program I begin to see some lines of ffmpeg but it gets stuck on this line

  Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 110x162 [SAR 1:1 DAR 55:81], 0.20 tbr, 0.20 tbn, 0.20 tbc

  note that eclipse doesn’t say that the program is < terminated >.
  This is the method I’m using to call the command :

  try{
  
              ProcessBuilder builder = new ProcessBuilder(
  
                      "cmd.exe", "/c",
  
                      //"cd \"C:\\Users\\Davide\\Downloads\\ffmpeg-20160811-b83d907-win64-static\\bin\" && "
  
                      ffCommand);
  
                  builder.redirectErrorStream(true);
  
                  Process p = builder.start();
  
                  BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
  
                  String line;
  
                  while (true) {
  
                      line = r.readLine();
  
                      if (line == null) { break; }
  
                      System.out.println(line);
  
                  }
  
  
  
                 }catch(IOException e){
  
              e.printStackTrace();

  where ffcommand is the line of code I wrote first.
  Thanks.

• FFmpeg video creation getting stuck while executed from java

  13 octobre 2018, par user11230

  I am using this line of code to create a simple video from an image.

  ffmpeg -framerate 1/5 -i C:\mydir\img.jpg -c:v libx264 -r 30 -pix_fmt yuv420p test2.mp4

  it works flawlessly if I execute it from the cmd. But if I call it from my java program I begin to see some lines of ffmpeg but it gets stuck on this line

  Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 110x162 [SAR 1:1 DAR 55:81], 0.20 tbr, 0.20 tbn, 0.20 tbc

  note that eclipse doesn’t say that the program is < terminated >.
  This is the method I’m using to call the command :

  try{
  
      ProcessBuilder builder = new ProcessBuilder(
  
                      "cmd.exe", "/c",
  
                      //"cd \"C:\\Users\\Davide\\Downloads\\ffmpeg-20160811-b83d907-win64-static\\bin\" && "
  
                      ffCommand);
  
  
  
      builder.redirectErrorStream(true);
  
      Process p = builder.start();
  
      BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
  
      String line;
  
      while (true) {
  
          line = r.readLine();
  
          if (line == null) { break; }
  
          System.out.println(line);
  
      }
  
  
  
  }catch(IOException e){
  
      e.printStackTrace();

  where ffcommand is the line of code I wrote first.
  Thanks.

• SDL2.0 Alternative for SDL_Overlay

  19 juin 2019, par Josh

  So I’ve been trying to go through the following tutorial on ffmpeg : http://dranger.com/ffmpeg/tutorial02.html

  However, when I try to compile using gcc, I get the following output :

  root:/Users/mbrodeur/Downloads/HACKATHON CONTENT/Tutorials-> gcc -o tutorial02 tutorial02.c -lavutil -lavformat -lavcodec -lz -lavutil -lm -lswscale -D_THREAD_SAFE -lSDL2
  
  tutorial02.c: In function ‘main’:
  
  tutorial02.c:41: error: ‘SDL_Overlay’ undeclared (first use in this function)
  
  tutorial02.c:41: error: (Each undeclared identifier is reported only once
  
  tutorial02.c:41: error: for each function it appears in.)
  
  tutorial02.c:41: error: ‘bmp’ undeclared (first use in this function)
  
  tutorial02.c:98: warning: assignment makes pointer from integer without a cast
  
  tutorial02.c:110: error: ‘SDL_YV12_OVERLAY’ undeclared (first use in this function)

  Now, I read that SDL_Overlay is no longer used in SDL2, so therein lies the problem. I’ve been poking around, but can’t seem to find anything helpful. Is there a replacement for SDL_Overlay ? Is it necessary ?

  SDL_Overlay is used in the following context :

  SDL_Overlay     *bmp;
  
  bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,
  
                         SDL_YV12_OVERLAY, screen);