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• running ffmpeg command in java Process hangs in waitFor()

  9 juin 2015, par Mahesha M

  I’m running ffmpeg command to generate video for given images (img001.jpg, img002.jpg ...) it’s creating slide.mp4, but it waits infinitely :

  public class Ffmpeg {
  
  
  
  public static void main(String[] args) throws IOException, InterruptedException {
  
      String path = "E:\\pics\\Santhosh\\FadeOut\\testing";       
  
      String cmd = "ffmpeg -r 1/5 -i img%03d.jpg -c:v libx264 -r 30 -y -pix_fmt yuv420p slide.mp4";
  
      runScript (path, cmd);
  
  }
  
  
  
  private static boolean runScript(String path, String cmd) throws IOException, InterruptedException {       
  
      List<string> commands = new ArrayList<string>();
  
      commands.add("cmd");
  
      commands.add("/c");
  
      commands.add(cmd);
  
      ProcessBuilder pb = new ProcessBuilder(commands);
  
      pb.directory(new File(path));
  
      pb.redirectErrorStream(true);
  
      Process process = pb.start();   
  
      flushInputStreamReader(process);                
  
      int exitCode = process.waitFor();
  
      return exitCode == 0;
  
  }    
  
  }
  
  
  
  private static void flushInputStreamReader (Process process) throws IOException, InterruptedException {
  
              BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));
  
              String line=null;
  
              StringBuilder s = new StringBuilder();
  
              while((line=input.readLine()) != null) {            
  
                  s.append(line);
  
              }
  
          }
  
  </string></string>

  Any suggestions ?

  After writing the function flushInputStreamReader, its working

• FFMPEG : Output video is running faster than input (canvas)

  19 juin 2015, par Abhinav

  I am trying to record a HTML5 canvas animation using PhantomJS + FFMPEG.

  runner.js

  var page = require('webpage').create();
  
  page.viewportSize = { width: 640, height: 480 };
  
  
  
  page.open('file:///Users/abhi/Documents/TJDev/Canvas/TJCanvasTheme2/index.html', function () {
  
    setInterval(function() {
  
      page.render('/dev/stdout', { format: "png" });
  
    }, 25);
  
  });

  But the output video is coming way faster than the actual animation. I have tried to vary the frame per second rate, but could not get desired results.

  I might be using some wrong parameters/flags I guess.

  phantomjs runner.js | ffmpeg -y -c:v png -f image2pipe -r 25 -t 10  -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart test11.mp4

  Question :
  Frame rate is how many frames are captured per second. So it should only contribute to the quality of the output video and not to its speed ?

  Can anyone help me to figure out this.

• Segmentation Fault when running ffmpeg+sdl program

  23 juin 2015, par user2270995

  I started with Dranger’s tutorials on building a video player using FFMPEG and SDL. The code tutorial4 compiles fine but when i run it i get a segmentation fault error. here’s the code for tutorial4.

  I am using gcc

  Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
  
  Target: x86_64-apple-darwin14.3.0
  
  Thread model: posix 

  on Mac 10.10.3.

  Here’s GDB Backtrace :

   Program received signal SIGSEGV, Segmentation fault.
  
  [Switching to Thread 0x1813 of process 84136]
  
  0x00007fff955d4432 in stack_not_16_byte_aligned_error ()
  
  from /usr/lib/system/libdyld.dylib
  
  (gdb) backtrace 
  
  #0  0x00007fff955d4432 in stack_not_16_byte_aligned_error ()
  
  from /usr/lib/system/libdyld.dylib
  
  #1  0x000000010a2f1ee0 in ?? ()
  
  #2  0x0000000101341008 in ?? () from /usr/local/lib/libSDL-1.2.0.dylib
  
  #3  0x00000000000005d0 in ?? ()
  
  #4  0x00000001013362e9 in RunThread () from /usr/local/lib/libSDL-1.2.0.dylib
  
  #5  0x00000001013362e2 in RunThread () from /usr/local/lib/libSDL-1.2.0.dylib
  
  #6  0x00007fff8d1d4268 in ?? () from /usr/lib/system/libsystem_pthread.dylib
  
  #7  0x0000000000006f23 in ?? ()
  
  #8  0x000000010a2f2000 in ?? ()
  
  #9  0x000000010a2f1f50 in ?? ()  
  
  #10 0x00007fff8d1d41e5 in ?? () from /usr/lib/system/libsystem_pthread.dylib
  
  #11 0x0000000000000000 in ?? ()
  
  (gdb) 

  Backtrace for another SIGSEGV :

  Program received signal SIGSEGV, Segmentation fault.
  
  [Switching to Thread 0x15eb of process 11453]
  
  0x00000001012c9475 in av_log_format_line ()
  
  from /usr/local/lib/libavutil.54.dylib
  
  (gdb) bt
  
  #0  0x00000001012c9475 in av_log_format_line ()
  
  from /usr/local/lib/libavutil.54.dylib
  
  #1  0x00000001012f7338 in av_pix_fmt_descriptors ()
  
  from /usr/local/lib/libavutil.54.dylib
  
  #2  0x00000018012f7358 in ?? ()
  
  #3  0x000000010a2f3010 in ?? ()
  
  #4  0x000000010a2f2c10 in ?? ()
  
  #5  0x000000010011d65a in ?? () from  /usr/local/lib/libavformat.56.dylib
  
  #6  0x000000010a2f3900 in ?? ()
  
  #7  0x0000000000000018 in ?? ()
  
  #8  0x0000000000000018 in ?? ()
  
  #9  0x000000010011d65a in ?? () from /usr/local/lib/libavformat.56.dylib
  
  #10 0x000000010a2f3900 in ?? ()
  
  #11 0x910016d093cdc267 in ?? ()
  
  #12 0x000000010a2f3eb0 in ?? ()
  
  #13 0x00000001012c96e8 in av_log_default_callback ()
  
  from /usr/local/lib/libavutil.54.dylib
  
  #14 0x0000000000000000 in ?? ()
  
  (gdb) 

  The call to SDL_WaitEvent in main method is where these errors occur in my debugging.

  for(;;) {
  
  SDL_WaitEvent(&event);
  
  switch(event.type) {
  
  case FF_QUIT_EVENT:
  
  case SDL_QUIT:
  
    is->quit = 1;
  
    SDL_Quit();
  
    return 0;
  
    break;
  
  case FF_REFRESH_EVENT:
  
    video_refresh_timer(event.user.data1);
  
    break;
  
  default:
  
    break;
  
   }
  
  }

  is this related to pthread library or sdl And how do i resolve it ?